We went a few weeks ago at 10am and it was roasting then. Plenty of juice stops with seats helps and it is all covered but very hot.

it starts about 6 in the morning and carry's on till about 4pm but it is very hot and you will get hassled as it is a maze, so pick your times carefully and take a small water with you to drink and watch your handbags and purses as you have to in any very busy area anywhere in ther world