Are you talking about PvE or PvP?
In PvE you'll likely need to be revived by your team, if your entire team dies, you will lose the mission and return to the tower most likely.
In PvP there aught to be a good 5 second respawning timer.
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Both, but you bring up a good point that there could be separate respawn timers for each game mode. Respawn timeouts could even be derived by the particular area, team, player level, etc.