No general rule for me, just combination of needs and interests, if I like something, I have time, I dig, if I need something I dig, if at a certain point my wi

No general rule for me, just combination of needs and interests, if I like something, I have time, I dig, if I need something I dig, if at a certain point my will start waning or my needs have reached a certain satisfactory point I stop. As a general rule: there is no too much knowledge. The trick is just avoid dispersion, concentrating on something leaving something else aside. And there is no magic formula IME for that...