There are 342 sleeps (342 days) until September 30 (Thursday, September 30, 2027).
There are 342 days until September 30 (Thursday, September 30, 2027) — one sleep per night.
One sleep per night between now and the big day — tonight is the first sleep, and the morning after the last sleep is September 30. Sleeps are the same as days.
342 sleeps is 48 weeks and 6 sleeps.