Please provide as many timings as possible to improve your chances of matching up with a perfect tutor.
The more qualified tutors are understandably more popular and hence usually run a busy schedule.
Selecting a wide range of timings also works in your favour with saving cost in the situation where there was two similarly qualified tutor and one charges lower rate but has limited slots.
A good selection of 10 timings might be as follows:
(E.g. Mon 6pm onwards, Wed and Thur 3pm Onwards, Sat before 1pm and Sun whole day)