Use a split-shift gap without overplanning it

Go home only when the round trip leaves more than half the gap intact. On a 59-minute each-way journey — the real weekday running time from Gresham Central Transit Center to W Burnside & NW 5th on TriMet's 20-Burnside/Stark, per TriMet's westbound timetable — a four-hour gap comes back as 1 hour 32 minutes at home once you add a 30-minute margin for the return. Where the trip is 15 minutes each way, the same gap comes back as 3 hours and the answer flips.

Subtract three things, in this order

Start from when you can actually leave, not the printed finish. Then take out both journeys and the margin you need to be back and ready. What remains is the gap.

The margin is not optional and it is not five minutes. Use the service frequency plus a walk allowance as the margin: TriMet says the 20 runs every 15 minutes or less most of the day, on the line's own page, so a 30-minute margin covers one missed bus and the walk. On a line running every 40 minutes, the margin is 40 minutes plus the walk, and the calculation changes accordingly.

The travel is unpaid on both legs. The Department of Labor's fact sheet on hours worked says normal travel from home to work is not work time, and the trip in the middle of a split shift is that same travel, twice more.

Compare the three options with real minutes

Example figures, using the 59-minute TriMet journey above and a gap running noon to 4 pm.

Scroll sideways to see the full table →

Row one is the surprise for most people. Four hours off and 92 minutes at home is not a rest; it is a commute with a sandwich in the middle. That does not make it wrong — an hour and a half at home covers a care handoff or a medication that has to be taken somewhere private — but it should be a choice made against the number, not against the word "home".

Know which rest rule your gap actually falls under

Two ordinances put a price on short turnarounds, and both are about the overnight gap rather than the midday one. Oregon's predictive scheduling law pays time and a half for work during the first 10 hours following the end of a previous calendar day's work or on-call shift, the Oregon Bureau of Labor and Industries says. Seattle's Secure Scheduling Ordinance pays time and a half for hours worked when a closing shift and an opening shift are separated by less than 10 hours, the City of Seattle says.

Read those two carefully before quoting either. A split shift inside a single day sits outside both rules; the gap they price is the one between last night's finish and this morning's start. Where your roster creates both, the overnight one is the expensive one and the one to raise first.

Example: whether the trip home earns its fare

Example figures on real fares. Gap from noon to 4 pm, 59 minutes each way. TriMet's adult fare is $2.80 a tap and the 2.5-hour ticket turns into a Day Pass at $5.60, which caps a day's riding, on TriMet's fares page. A four-hour gap is longer than 2.5 hours, so the trip home costs the second tap and lands on the $5.60 cap. Going home leaves 1 hour 32 minutes for $5.60; staying near work leaves 3 hours and costs a coffee. Over a five-day week the home trip costs $28 and returns 7 hours 40 minutes at home; staying returns 15 hours near work.

The arithmetic does not decide it. If those 92 minutes are the only time a child is awake and at home, $5.60 is a low price and the sum is over. If they are 92 minutes of lying down before an evening shift, three hours in a quiet room near work does the same job for nothing. What the arithmetic settles is that you are choosing between 92 minutes and 180, not between "home" and "stuck at work".

Write one line per gap and stop re-deciding it

Decide once per roster pattern, write it down, and leave it alone until the timetable changes. Re-running the sum every week is another job.

Keep the line beside the commute card with your last departures on it, and if a second employer is filling these gaps, the arithmetic changes shape — that is two jobs on one calendar, where the bridge between them is the constraint rather than the gap itself.

The line to write tonight:

Tue/Thu gap noon–4 pm: home = 1 h 32 m for $5.60 round trip. Near work = 3 h 00 m. Default is near work; go home only when the first shift releases by 11:04 am.