Dear candidate, although a fixed time cannot be predicted of how much time to invest on Organic Chemistry but yes you need to practice the concepts where you feel you need more time. Practice the Conversions, Grignard Reagent and it's effects, Cannizaro, Aldol condensation, Alcohol evey Preperation and reactions etc. Apart from them try to prepare Organic Chemistry by self notes, focus on other Nomenclature part as well. Every day invest atleast 40 mins of yours for organic, if you need you can modify it.

Good luck!!!