What would be considered to be an extended period of time? I got banned for ABing 2 hours a day before. My settings made each buy take 3 seconds, too.
Well.....i make my buy times extremely fast, also, i "introduce" or "get familiar" with the shop using an aber by slowly extending the time spent and the item value i go for. This looks VERY human. Don't get stuck in one shop. NEVER a good idea. After a while, you should be able to use EXTREMELY fast buy times with multiple hours of abing relatively safely
TNT does collect evidence, i tried to ask them to return an acc, and they said based on the EVIDENCE, we cannot return this account to you. So, make it look human as possible. Set your aber to look like what you would do. Again, chocolate factory, bakery, even card shop