27 Surprisingly Profitable Ways To Spend Your Retirement Photo credit: CC license by US Embassy 5. Substitute Teachers Substitute teachers work flexible hours and can take as many or as few days of work as they want. Requirements vary, but most school systems require at least two years of college in order to sub for their district. Long-term assignments are available for those wishing to work more hours in a particular classroom or discipline. Prev5 of 28Next Facebook Comments comments