Members may schedule planes online or via a toll free phone number. Here are some excerpts from Twinco's "Operating Rules"

There is no limitation to the hours scheduled during individual weekdays except holidays.

Weekend and holiday scheduling limitations:
One half day per week
One full day per month
One full weekend, including holidays, per three month period

These limitations do not apply if the aircraft is not scheduled the day prior to the Saturday, Sunday or holiday

Long periods of scheduling are available with President or Vice-President approval:
Four to eight consecutive days per three month period.
Nine to fifteen consecutive days per six month period.
Twenty Two consecutive days is the maximum period that a club aircraft may be scheduled.

Schedule a club aircraft on the Schedule Master Website