@Jeremy698 Actually, no. Your guests pay by the "day." They pay for units of time between check-in and check-out. Why are you anxious to give them extra time, and therefore extra opportunity to use your utilities, supplies and space?
Doing this can also create a rush to turn the place over, as opposed to having ample time between guests.
I do try to accommodate guests with early check-in when I can, but never more than two hours. When I have same-day turnovers, I need every minute in between guests to clean, sanitize, and do things like mow the lawn. If they ask on those days, I just say no.
I'm always thankful for a breather between guests. I'd also never accept same-day bookings.