Temp-to-hire openings around San Diego - first time posting

A staffing agency says some roles convert to permanent after 3 weeks. I would rather hear the honest version than the polite one. Hours ramp up in the coming weeks. Has anyone been converted to permanent?

Apply to several. Start dates and schedules change quickly and having options helps.

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