On casual collective some have times under 2 minutes!! http://tinypic.com/player.php?v=ddnz2b&s=5
Well apart from that the time barrier for sprint is around 9 minutes.
EvilRivaL and others: Juggling is not noobish or bad at all. Juggling is bad if you build a very long maze and put one bash tower in the middle. But if you use juggling with "respect" it is a very effective tool since you can build a short maze with very heavy aoe damage and then juggle on bosses and hard wavesetc. I am almost sure that even ayumi juggle now and then :P
THe problem with this type of game is that you can use the same tactic from level 1 to 10 with minor modifications. Also lifesteal+teleport is way to overpowered, with 100+ lifesteal you can easily reach level 90+
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