There aren't any restrictions set up in the data capture to limit visits from a single account. The only limit would be based on what you're counting as a unique visit. For example, if a new visit needs 30 minutes of inactivitiy, then in a single day, a person (on the same device/browser) could have a max of 47 to 48 visits, just based on there only being 24 hours in a day and them coming back to the site every 31 minutes. But that's not very likely to happen. Theoretically, someone could clear their cache and keep coming back as a new user much more than that. But again, most people aren't going to do that.
Are you looking to try and limit visits from an account? What is the purpose of finding the upper limit of this?