all the cases, the time taken is same.
let us consider a circle of radius 1m.
Case 1 90 degree
distance to be covered = 2 m
acceleration = gsin90 = g = 10
time = 0.63
Case 2 60degree
distance to be covered = sqrt(3)
acceleration = gsin60
time = 0.63
similarly case 3 also, t=.632 seconds
thus, time taken is same