There are 329 sleeps (329 days) until September 17 (Friday, September 17, 2027).
There are 329 days until September 17 (Friday, September 17, 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 17. Sleeps are the same as days.
329 sleeps is 47 weeks.