Length of high?

I have a question about the length of time the effects last:

I notice that different strains from the dispensary have varying lengths. The high from from the product of my first grow (outdoor White Widow Auto) are hard-hitting but short- lasting.

Is it all about the strain, or can you manipulate the length of high during the grow?

Mostly strain related but there are techniques you can do during the grow to add thc . Not sure about making it last longer.

About the strain and genetics contained in that strain