Personally I wouldn't seal this floor without it being dry although 8 days seems alot, I'm assuming you have pressure washed them and they weren't previously sealed. The problem with these tiles are that they are porous and will have water held in them even when they 'seem' dry, they will also need several coats of seal because of this. Speed up the drying process by installing a dehumidifier or even an air mover.
Fox