The number of turns you can take per 24Hrs depends on you character's RANK and is described in the table below (After a player's last turn, the counter resets itself):
Rank of hero
Number of SPINs
Bronze 1
4
Bronze 2
5
Silver 1
6
Silver 2
7
Diamond 1
8
Diamond 2
9
Extra Spins
The cost of an 'Extra Spin' depends on the LVL and RANK of a character: The higher the rank, the higher the cost. This is done to keep an equitable balance amongst the different ranking characters in the game.