I realize the professionals have the best compressor to winterize sprinklers but what is the minimum size compressor someone can use at home to get job done? Cfm? Thanks

My neighbor has a small one. Unfortunately, I don't know the size or I'd post it. It's a home-sized unit, intended to drive power nailers, etc. He just leaves it on for half an hour per station and it does the job. I haven't gone that way yet. I pay someone with a big truck and compressor to blow it out. They leave the air on for one minute for each station (maybe not even that long).