How shoot days are numbered
The count starts on day 1 of principal photography and only moves forward on days the unit shoots. A call sheet header might say:
THE LONG DRIVE. Shoot Day 6 of 18. Tuesday, October 6. General crew call 7:00A.
If the company takes Saturday and Sunday off, Monday is day 5 and the following Monday is day 10. A travel day between locations doesn't get a number, and neither does a rehearsal day. When a day is added mid-shoot, many productions renumber everything after it; others keep the original numbers and add a letter (day 12A) so the paperwork people already filed still lines up.
Shoot days on the board and the calendar
On a stripboard, a shoot day is everything between two day breaks. On the production calendar it is a date. Keep both in view: a board that says 18 days can turn into four calendar weeks once weekends, a holiday, and a company travel day are added. Crew weekly rates, equipment rentals, and location fees are often booked by calendar week, so the calendar length matters to the budget as much as the day count.
Sizing a day
A shoot day is defined by hours as well as scenes. If general crew call is 7:00A and the show plans a 12-hour day, camera wrap is around 7:30P once a 30-minute lunch is added in. The AD fits scenes into that window by setups. The page count rides along as a sanity check: 5 2/8 pages on an 18-day, 97-page schedule is close to average, while 9 pages on the same show should make someone ask how many setups that is.
Common confusions
"Shoot day" and "script day" get mixed up in wardrobe notes. "Day 4" in a costume continuity binder usually means story day 4, not shoot day 4, so label them differently (D4 vs SD4 is common).
People also say "we lost a day" loosely. If rain kills a day and the company goes home, that date may be a paid shoot day for weekly crew even though the day count on the board doesn't move. The production report records it either way.
For a rough day count before you've built a board, the shoot days estimator takes a page count and pace and gives a starting number.
