@Sandy746,
I have set 2 p.m. for the check-in and checkout time, and 24-48 hours between bookings. These times are earlier and later than the customary times of 4 p.m. check-in and 11 a.m. checkout. I generally don't accept more than an hour deviation due to my or my cleaners schedule. If they really want the extra time, and the suite/apartment is available, I do charge one-half of the standard nightly rate for up to four hours. A longer duration would require booking the prior or subsequent night.
I understand that guests just want to get to their rental after traveling, but it is unreasonable to expect a host to change the work schedule of the rental's support team or incur additional cost for the extended stay.
In St. Lucia, all long-haul international flights come from Canada, US and UK, and arrive in the afternoon and evening. It's only the regional flights that land in the morning. I've had people ring me as early as 7 a.m. to let me they've landed, and should arrive in 30 minutes. I just remind them of what's on their itinerary and has been said I my guest greeting messages, check-in is at 2 p.m. Usually, we accommodate for gratis requests that are made in advance for an early check-in that will also have an early checkout.