The stamina mechanic of the Madden NFL Mobile games no longer exists so you do not have wait for stamina refills is order to continue playing. In Madden NFL Overdrive the PvP modes such as Overdrive H2H and Intraleague play are unlimited.
Although the the stamina mechanic is no more you will discover that the solo events are a lot more restrictive than before. Weekly Events for example can only be completed once and Daily Events can only be played once for free before you need Blitz Tokens to play them again.