Check Small-Group Lab Rotations Against a Session Window — Free
A station plan can list every activity and still run past the room booking. Multiply groups by the time each group needs in sequence and compare the rotation with the session window.
The proof surface
Lab-equipment sharing binders coordinate who borrows an instrument. This ticket checks sequential group time in one teaching session, not custody, booking rights or equipment availability.
Why the flat version breaks
Counting stations instead of sequential groups
The multiplier is groups per lane, not station count when stations work in parallel.
Leaving transitions out
Every handoff that uses the booked window needs to be represented.
Treating time fit as laboratory approval
The tool knows nothing about hazards, supervision ratios, equipment or institutional rules.
How to work the station rotation time docket
If stations run simultaneously, model each parallel lane separately. This simple calculation assumes the groups take turns through the same timed stage.
Include the segment this rotation represents. Add setup, instructions, transitions or cleanup separately if they consume the same booked window.
Five groups at twelve minutes each need sixty minutes. Compare that with the available session time entered once for this run.
If it does not fit, reduce scope, add a session or arrange genuine parallel capacity. Never compress a required safety briefing to force the arithmetic to pass.
What the station rotation time docket replaces
| Question | Before | Visible working |
|---|---|---|
| Counting stations instead of sequential groups | The multiplier is groups per lane, not station count when stations work in parallel. | Estimate time per group from the plan |
| Leaving transitions out | Every handoff that uses the booked window needs to be represented. | Multiply to find required minutes |
| Treating time fit as laboratory approval | The tool knows nothing about hazards, supervision ratios, equipment or institutional rules. | Revise the timetable, not the safety step |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Scheduling arithmetic only, not laboratory safety, supervision, equipment suitability or academic approval. Follow the lab manual and institutional safety procedure; a qualified supervisor decides whether a rotation is safe. A passing time total cannot establish safe staffing or equipment use.
Data note: Everything runs in this browser tab on the station rotation time docket: your section | groups in sequence | minutes per group stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a clerk's docket sheet
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the station rotation time docket reading, and holds your drafts on this device — one free run, then $ 4 one-time for the layer that keeps filing.
The station rotation time docket reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the check small-group lab rotations against a session window companionBoundary
Scheduling arithmetic only, not laboratory safety, supervision, equipment suitability or academic approval. Follow the lab manual and institutional safety procedure; a qualified supervisor decides whether a rotation is safe. A passing time total cannot establish safe staffing or equipment use.
What this is built on
- Method: the equation is stated next to the result and uses only quantities entered by the reader.
- All sample records are invented examples. No standard, tariff, product rate, schedule or policy is fetched or represented as verified.
- For any threshold or rule, use the current value from the provider, handbook or qualified professional responsible for it.
Before: The multiplier is groups per lane, not station count when stations work in parallel. After: the station rotation time docket shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this station rotation time docket, an external AI text tool may help format non-sensitive notes if you already use one. No AI service or account is required: manual entry completes the same free core calculation. Do not paste private or sensitive data. Review every value against the source before using it.
Format my non-sensitive notes for a station rotation time docket. Return plain rows only: section | groups in sequence | minutes per group. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: section | groups in sequence | minutes per group. No AI response is executed as code.
Walk three labelled examples
First reading. The invented sample Wet-lab block | 5 | 12 uses available session minutes = 50. The displayed longest section rotation is 60.00000 minutes required. Follow the row note back to the measurements and conversion rather than treating the headline number as a recommendation. The sample is deliberately concrete so the reader can reproduce the arithmetic by hand.
Changed assumption. The alternate input Intro stations | 4 | 10 produces 40.00000 minutes required for the displayed summary. Compare it with the first reading to see which entered quantity moves the result. In a real plan, change only the assumption that has a traceable source; do not tune a value just to make a row pass.
Boundary case. With Four rounds at twelve | 4 | 12 and the same setting, the worked result is 48.00000 minutes required. This case shows how the arithmetic behaves at a useful edge, not that the underlying process has been measured or verified. Check the boundary statement beside the result and confirm any consequential input with the responsible person before acting.