Theres 3 shifts for each store, just make notes of what shifts you go in a notepad or excel and spread it around. Play a different shift/different store every time you want to play again. Keep mixing it around and you can last a while with just 3-4 stores if you know what you're doing. If you can get 4 stores, that's 12 shifts you can attack. Mix and match as best you can and it should be hard to detect you. I say stick to 5 hour sessions max, if you're pure wonging 2-3 hours max. Also I recommend you mix in a 1 hour session where you are completely aggressive with an aggressive spread, but plan that shift out accordingly. good luck