Pokestop ban: - Occurs when you search roughly 2k pokestops in a 23 hour timespan. - No bypasses known.

Pokemon ban: - Occurs when you catch 1k pokemon in a 23 hour timespan. - Potential bypass by throwing missing pokeballs 15-30 times. (I haven't confirmed) Both of these bans have the potential of being lifted every hour.

After ever hour, if your total pokemon / pokestops in the last 23 hours is below the ban threshold, you'll be unbanned. If you surpass that threshold, you'll be banned again.