I cut my hair to shoulder length from mid-back a few years ago.
I get it trimmed every 4-6 weeks to keep it under control, I have very thick hair so have to get it thinned out, too.
It's pretty much wash and wear for the first few days, then on the third day I have to put the straightener through the top, as it gets a bit ****y, itms.
I wash it every 4-5 days.

Best thing i ever did.