Is there any traffic limit in Blogger or Blogspot?
Unless you're hosting illegal files, in which case you'll be shut down faster than you can google "where did my blogger account go?"
There is no limit for the traffic or the number of visitors etc.
it has an unlimited bandwidth.
but it has a limited storage of 1 gb on your blog which is a different thing. no limit on traffic.
more details :http://www.digitalgupshup.com/what-is-blogger-blogspot-hosting-bandwidth-limit