Spider mites have a 10 - 15 day hatch rate. You should apply the oil for 2 days straight and then wait for a week. Then spray every other day through day 14. After that you should be good to go except that it only takes 2 survivors to start the cycle again. Monitor your plants carefully and reapply at the first sign of re-infestation. Repeat the cycle. The best way to get rid of them for good is to sterilize your room, pots, equipment, etc. once this grow is complete. You should not need to chop them early if you catch the cycle.