Seasonal jobs that might turn permanent - 12 weeks in

A staffing agency says some roles convert to permanent after 11 weeks. I worked as an electrician's helper before this. Hours ramp up in the coming weeks. Has anyone been converted to permanent?

Keep a list of supervisors' names. A reference from one of them helped me land my next job.

I was converted after one season because I showed up every day and volunteered for extra shifts. Managers remember that.