Hypothetical: can I schedule short walks from my dog (5-10 minutes)?

Hello,

I do not own a dog right now, but I am trying to map out expenses and see if I could afford it next year after I move to my next apartment. I was told, without a yard, I need to walk dogs five times a day. I plan to walk them 30 minutes in the morning, an hour at night, and get a walker for 3 pee walks while I'm at work. These would take 5-10 minutes, so I was wondering if that is a possibility? Or would I have to pay a minimum amount (i.e. one hour of service)?

Also, do the fees differ between areas? I live outside of boston (charlestown), so what would my fees be?