I do not know how many hours of gameplay they offer, I have not tested that yet.
As for Tutu, uhm, well someone is probably going to test that, yes. Personally I have played through the entire game with the mod installed to test it and I certainly do not want to do that again with Tutu. Still, I am going to test whether it installs correctly on Tutu and appears to play the way it should. Determining whether it has any Tutu specific bugs might be up for the players to do. Overall I do not think it is going to be that desirable to play with using Tutu seeing as FotD is not compatible with the Tutu fixpack (the fixpack overrides changes in FotD and vice versa).
-Echon