Dealing with minor injury strains

I was doing reverse lunges today and while I improved my technique at the same weight as last week my left leg was really pushing hard and the hamstring took over. I could feel a very slight strain for the next exercise which I wasn't trying to use the hamstring for with walking lunges.

I think next week I'll drop the weight slightly and focus on finishing the sets at the weight with the better form.

How long does it usually take to recover from a minor strain. I can really only feel it when doing a push back and it is minor.

I'm already intending on having 2 full rest days and starting Tuesday night but considering extending the leg day to Wednesday night.