8
That's 7 hours IF they're both on the same day.
72 hours
It is 18 hours from 10AM to 4AM. You can figure this out in a few different ways. 10AM to 10AM is 24 hours and 4AM is 6 hours before 10AM. 24-6=18 10AM to noon is 2 hours. Noon to midnight is 12 hours. Midnight to 4AM is 4 hours. 2+12+4=18
Between 10am and 9pm, there are 11 hours.
8
MON-FRI: 9am - 5pm / SAT - SUN: 10am - 4pm
5pm UTC = 9am PST = 10am PDT
Mon-Fri 10am-9pm Sat 9am-5pm Sun 1pm-5pm
9am, 10am, 11am, 12pm, 1pm, 2pm, 3pm, 4pm, 5pm. 8 hours.
MON-FRI: 9am - 5pm / SAT - SUN: 10am - 4pm
MON-FRI: 9am - 5pm / SAT - SUN: 10am - 4pm
MON-FRI: 9am - 5pm SAT - SUN: 10am - 4pm
MON-FRI: 9am - 5pm / SAT - SUN: 10am - 4pm
MON-FRI: 9am - 5pm / SAT - SUN: 10am - 4pm
Library hours: Mon - Thu: 10am - 9pmFri - Sat: 10am - 5pmSun: 12pm - 5pm
9am to 5pm Mon, Tues, Thurs and Fri 10am to 5pm Wed 9.30am to 1.30pm Sat