Restaurant Office Manager

Hi! Looked up ChickFilA on indeed for a part time position, one of the jobs that popped up was Restaurant Office Manager. I have experience doing most of what the description asked and the pay is good but I also noticed it said 20 hours a week. Now this is perfect as it is exactly what I’m looking for but I’m also confused because i’ve never worked for a company that has such a specific job with lots of responsibilities but not requiring a 40 hour work week. Just wanted to ask how legit this is and if any one currently holding this position could shed some light!