Future drying times...

I read somewhere that you're supposed to let Future dry 48 hours after airbrushing or brushing it on a model, but then when I read the instructions on the Future bottle it said 8 hours. Which recommendation should I follow? So far, I've been using the 48 hour method, and had success. However, if I could speed things up by only having to let it dry 8 hours, that would be nice. Also, I need to know the drying times when using Future for these purposes:

1. dipping clear parts in pure Future or tinted Future
2. brushing Future on a small area in preparation for a decal
3. airbrushing a whole model with it (how long to dry in between coats and after the last coat)

Also, pardon me for going a little off subject, but would it be cheaper to use Testor's flat clear instead of mixing Tamiya base (or whatever the product is called) and Future? Thanks in advance.