2-4 hours minimum on weekends; I like to dedicate an afternoon on saturday. If I can play competition golf or a course it's sunday.
depending on work (agency locations change) I go to practice for lunch, that 5 hours of practice per week.
the thing is I love practicing, especially my short game shots around a green with friends we play closest to the flag, hitting range boards etc.
One thing I've learned : a big volume of practice is of very little help. i progress really when i take lessons. practice is really for the touch, confidence and fun part but not much more.