Yes. Confirmed bookings appear in the project Work Log as calendar entries, one per day per person. All-day bookings count as 9 hours.
Yes. When a booking is confirmed, it appears in the project's Work Log as a calendar entry for each person invited, one entry per day of the booking.
A booking with a start and end time counts its length. An all-day booking counts as 9 hours for each day.
Hours people log by hand appear as manual entries beside them. In Reporting, Timesheets you can show all hours or manual entries only, so booked time and logged time can be looked at separately. Avoid logging a booked visit again by hand, or it will be counted twice.