Scheduling policies nearly always include a most-hours-per-day cap and a most-days-in-a-row limit. We ran both through the shift roster builder on its built-in invented cafe (7 people, 32 shifts, 235 hours), one limit at a time.
Daily cap. No cap, 12 and 10 hours: 3 shifts open, 216 hours covered, $3,622. At 9 and 8 hours: 4 open, 209 hours, $3,505, because nobody can stack a 3-hour lunch on an 8-hour close. At 6 hours, below the longest shift, 27 shifts go open: a typo to look for.
Days in a row. Six (the default) costs nothing. Five leaves 4 open and pays $36 more; four leaves 5 open yet covers 220 hours, since the short shifts are dropped first; three leaves 7 open.
So watch open shifts, not just hours or payroll. One invented example, not a benchmark. The page has the tables, and a test re-runs every figure through the engine.