I am applying homeopathic hair oil to stop the hair fall. Can I apply Minoxidil 5% along with that in a gap of 10 hrs?

Minoxidil should be applied twice daily. If you plan to use a hair oil be sure to use 2 hours after the minoxidil and be sure to wash off before your next dose of minoxidil is applied. Keep in mind there is good evidence for minoxidil's benefit in androgenetic alopecia and limited no even no good evidence for various homeopathic oils. If you are going to use minoxidil and you are committed to its use, don't compromise outcomes.

If you use minoxodil you should apply it to your scalp not your hair as the value is in stimulating the scalp to produce hair