Hi Jagminder, Malana is around 3 hours trek and Kheerganga is 6 hours. You can choose to do both. Spiti Valley can be done in a week but it will be very hectic. You can find more details in the trips attached below. Keep exploring!
Kasol to Malana and Kheerganga is a better option since it will also give you a little time to relax, put your feet down and chill! A road trip through spiti will be quite tiring besides you might not be able to do it justice in such less time.
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