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Left for money, but now want to go back to Big4

So I took your guys' advice at http://www.goingconcern.com/topic/open-items/best-raise-percentage-a2-s1 and took a low 100k job (cybersecurity at a bank, VP level, midwest).  Been here a few weeks and I want to get out already. People don't check emails after 5pm and most of them don't even have email on their phones. Things take forever to get done. There's 0 travel which is starting to bug me actually. I miss the consultant lifestyle and I think I have a good shot at making partner eventually. The firm I left is also ready to welcome me back any time.

Questions:

1. How long should I stay so that it won't look bad on my resume for future, in case I go back to industry?

2. If I jump back to a Big4, could I possibly get a manager level position with 2.5yr exp?