Hi, Pix! But with the exeption of class 9 (3 TS in DL max).
Dear, Krish! You may find all info about multislot classes and higher multislot classes in 45.002. As I know currently the maximum numbers of TS in DL is 5.
If network has enough resources for packet data, then it may to grant others 4 pdch to another MS (horizontal allocation). If there is scarcity in resources then the new MS is multiplexed in the same 4 TS (vertical allocation).