[+Rep] Wired Help

Zuth and I are testing out a part in his maze. At this part we want people to have 30 seconds to get across to the end, if they don't make it within 30 seconds they get tele'd back to the start. Is this possible and also can more than 2 person be able to use this at any one time.
If it is can someone help us by telling us what wired we'd need? I thought of something like User on furni, teleport to furni, More than X time till timer reset, then a timer reset.

Here is a picture of the area:
http://i39.tinypic.com/wgwxlv.jpg

I shall also bid in on the rep as we really need help! @Ellz; @Nick;

Trigger: User walks on furni
Condition: More than x secs have elapsed
Effect: Teleport user to furni

You can have two people do it but timer will start so the 30 seconds would start as soon as the first person goes.
For the timer you need:

Trigger: User walks on furni (starting ones)
Effect: Timer Reset

Although with this the timer will reset every time another starts. You may be able to use a condition: more than x secs have elapsed and set that to 30 seconds and add it to this pile. That should work.

Will