TurboFloat: Is there a maximum lease time?

Is there a maximum on what the user can set for <lease length="Amt"/> in the config file for TurboFloat? It really seems like there should be.

There is. It will be increased in the next version (because we found the cause of a particularly nasty bug that has been plaguing us for quite a while). We don't recommend you go above 2 hours. 30 minutes is recommended (hence the default).

So just to clarify, the maximum lease time is currently 2 hrs? Or is that when a bug starts manifesting?

It's below when the bug starts manifesting, but it's a safe maximum (with the current version, at least).