Minimum is a 30 day ban, but can vary depending on the reason. If you have pro account, you can check the reason why your account was suspended under power up rewards membership--->Rewards Activity. You can also chat with a representative and they might give you the reason why and/or for how long (depends on who you get).
I might be mistaken but I believe you only get a message there if you're banned manually. Automated bans (ie. "trade limit exceeded") don't give a message on our end
I believe this might be correct as I hit the $2K threshold (associate said wasn't able to trade in my last transaction since I hit the max for a set period [aka 30 days] but to come in at a later time).
My power up pro account doesn't have a note on the activity other than my points from sales so hoping it's only a 30 day system generated trade ban.