Send the request 30 days before the first shift you want off, name the exact shifts rather than the dates, and say which process you are using. Thirty days is not a guess: Paid Leave Oregon tells workers to let the employer know at least 30 days before planned leave, on its page for employees. Federal unpaid leave runs on a different clock, and an employer's own vacation policy on a third, so the first job is working out which of the three you are actually asking for.
Work out which process you are in before you write anything
Three routes exist and they answer different questions. The comparison below uses the figures each program publishes.
Scroll sideways to see the full table →
| Route | What it requires | What it gives |
|---|---|---|
| FMLA (federal) | Employer with 50+ employees in 20+ workweeks and 50 within 75 miles; 12 months' service and 1,250 hours in the prior 12 months | Up to 12 workweeks of unpaid, job-protected leave in a 12-month period |
| Paid Leave Oregon | At least $1,000 earned in the base year; 30 days' notice for planned leave | Up to 12 weeks of paid leave a year, plus up to 2 more for pregnancy or childbirth health needs |
| Employer PTO or vacation | Whatever the written policy says | Paid time at the rate and balance the policy sets |
The federal figures come from the Department of Labor's FMLA fact sheet, which also sets military caregiver leave at up to 26 workweeks in a single 12-month period. The Oregon figures come from the Paid Leave Oregon employee page. Your own state runs its own program or none, so look up the equivalent page before you use either number in a message.
A request that names the wrong route gets answered as if you asked for the wrong thing, so read the difference between PTO, sick leave and FMLA before you write.
List the shifts, not the days
"Friday off" breaks on any overnight roster. A shift starting 10 pm Thursday and finishing 6 am Friday is Thursday's shift on most systems and Friday's in most people's heads, and the two readings differ by a whole night of coverage.
Write the shift start date and the hours: "the shift beginning 10 pm on 18 June and the shift beginning 10 pm on 19 June". Two lines, no ambiguity, nothing to re-ask.
Do the same for a partial day. "Half day Tuesday" hides whether you are taking the first four hours or the last four, and on a roster that pays a shift differential after 6 pm the two halves are not worth the same. Name the hours: "the second half of the shift on 18 June, 2 pm to 6 pm".
Then put the count in the message. A manager reading "two shifts" is checking two gaps in the roster; one reading "the 18th and 19th" is checking a calendar and guessing what it means.
Send the request with the deadline in it
"I am requesting time off for the shifts beginning 10 pm on 18 June and 10 pm on 19 June. Please confirm whether these are approved and whether they need submitting anywhere else. I need an answer by 19 May to confirm the travel booking."
Record the date you sent it and any reference number the system gives back. If the answer comes in a corridor, put it in writing the same day: "Thanks — confirming you said the 18th and 19th are approved and nothing else needs submitting." A spoken yes and an approved request are different states, and only one of them survives a change of manager.
If the leave is unexpected rather than planned, the clock is shorter. Paid Leave Oregon says to tell the employer within 24 hours of starting the leave and to give written notice within 3 days, on that same employee page. Under FMLA, the DOL fact sheet says an employer asking for information from a health care provider must allow 15 calendar days for it — so a certification request is not a same-week emergency.
Example: 12 workweeks read against a 4-on-4-off roster
Example figures on the FMLA number. Twelve workweeks is twelve calendar weeks, not twelve weeks of shifts. On a 4-on, 4-off roster of 12-hour shifts, 12 workweeks covers roughly 42 rostered shifts — about 504 hours of work — because half the calendar is already off.
Do that arithmetic before you plan the absence, not after. A worker who thinks in shifts will read "12 weeks" as 12 weeks of shifts and plan an absence twice as long as the one available.
On a five-day roster the same 12 workweeks is about 60 shifts and roughly 480 hours. Work your own figure out once and quote that number rather than the word "weeks".
Leave one handoff note and one return line
Write two short lists on the last shift before you go: what is finished, and what is waiting on someone. Name the person for each waiting item, not the team. That is the same note as a clear end-of-shift handoff, written once for a longer gap.
Add one line for yourself about the return: a single sentence saying where you stopped, short enough to read standing up on the first shift back. Anything longer goes unread.
Finish with a single diary entry for the day the answer is due, carrying the figure and the deadline:
19 May — no answer yet on the shifts beginning 10 pm 18 and 19 June? Ask again in writing, quote the request sent 19 April, and say the travel booking is confirmed by the 22nd.