That will again depend on the size of the request.
Blindly trusting the numbers from this stack overflow thread (as I'm not that deep in the TCP protocol typically): https://stackoverflow.com/questions/31378403/how-much-data-it-cost-to-set-up-a-tcp-connection
Without keep alive it would be opened and closed each poll, so 296bytes / poll. 24 * 3600 * 296 = 25574400 so maybe 25.5MB / day
But I would still encourage you to meter it if that overhead is important.