I work for a big 4 and we mostly work either downtown in the office or at client site in the suburbs

I'm an auditor for a mid/regional size firm in California, so we have clients in town and as far as 5-6 hours away. If you work for a mid to large size firm, there is a good chance they will have some out of town jobs, so busy season you can expect to be gone a good chunk of time. My worst "audit year" had me stay 120 days plus out of town, but I'm expecting to cut down to 60 days this year. Mind you this is spread out across the whole year.
I work for a big 4 and we mostly work either downtown in the office or at client site in the suburbs (about an hr of commute). I heard there use to be more traveling out of state but since the recession hit, a lot of the engagements are cutting down on that.
I worked for a midsize public accounting firm until a few months ago and I traveled all the time. I only had one in town client...if I'm remembering correctly I was out of the office 17 or 18 weeks in 2012. Most of those were M-F clients and a handful were M-Th. During busy season, minneapolis hotel reviews I was out of the office 8 weeks in a row. It was crazy...yeah, you can probably guess why I left... :)
I also work for a small regional firm. Personally, I do not travel much, but there are people from our company that has been assigned to traveling engagements. If they are big, they travel weeks at a time. If it's not as big but still requires traveling, maybe a week tops.