Basically, time when you suicide. The respwans come after so many seconds, so if you have the gameclock switched to one, only suicide if you know you'll respwan in like 3 secs.
Jedi are crucial on hoth for the actual objectives. Especially opening the bridge and retrieving the access codes.
I think they're more of an escort on dessert though.
On hoth (on a pub sderver) I respwan as tech, jedi, assault and you can basically complete the objectives single handedly as long as the opposition are as equally disorganised (just hope that your team at least tries to dool some guy stupid enough to follow them).