Did some searching and can't find one, although I know some exist. A plugin that records how much time a player has spent playing, then runs commands or does stuff after X amount of time.
Gunnerrrrr I know that OnTime tracks the amount if time a player is online, I dont know about the commands though
Yep, OnTime does support commands. See here: http://dev.bukkit.org/bukkit-plugins/ontime/pages/rewards/#w-command-rewards-notes And here: http://dev.bukkit.org/bukkit-plugins/ontime/pages/commands/#w-add-command-reward