Weekly instruction amount - preferences?

[tac-tics]

Hi. I'm going to start taking lessons next semester down by my college with a small music store. The lessons are either 30 minutes per week or an hour per week.

I was wondering, which sounds like a better deal? Personally, it feels like 30 minlutes wouldn't be long enough for 1-on-1 instruction. Can any experienced people give me some of the pros and cons of each or personal experience or preferences concerning this decision?