One hour a day will do fine. You can even take the weekend off.
what do you think you should do on your one hour on? i been doing Wang Ji Wu's, "Body Strengthening and Health Maintenance Exercise", among other stuff as I understand it (fwiw 0%) from Tim Cartmell's "Xing Yi Nei Gong" book. Simple moves. They are his refined 16 moves that he suggests. pretty simple. but...well... you`kno how it goes