Dhiraj,
After looking into this, it seems the call just isn't meant to be used this way; the user's login time is only tracked for their last session, and this is the information used to put together the list for the users/visited call. The documentation on this might just need to be updated to clarify, but as of now there is no support for tracking which users logged in during a given time period.
I'm sorry there isn't a call to support this exact use case, but if you don't need the actual identities of the users who logged in during a given time, but just want to know the number, there may be a metrics call you could use, or else there may be some way to retrieve information on an individual user's logins. If you'd like I can try to look into one of these alternate methods of getting user login info, I just don't think that you'll be able to get the exact information you expected from the users/visited call in that format.
Best,
Jake Scheps
