Withdraw all SB at once or a little bit at a time?

I was dumb and wasn't really watching my SB balance until it hit $450. I obviously don't want it just sitting there but would it look suspicious if I withdrew it all at once or should I make several smaller withdrawals over the course of a few weeks or so. I've had my account for several years so it's not a case of a brand new account racking up a lob of SB in a short time and then taking them all out.