I wouldn't mind 15 minute, but others may think it is too long. Maybe try 12 for week two to see how it goes and how everyone feels about it?
Edit: And Pepsi, this weekend is a good tie I assume? Like before?
I fly to Spain very early Saturday morning, so I'll only be available your time until about 4pm Friday? I'll be free all evening on Thursday though. After that I won't be around until Tuesday.
I most likely can do before 4PM on Friday, def cannot do Thursday though. I should be back from class around 11am Friday so will let you know.