Omaha/8 Drawdown

At typical loose low limit Omaha/8, there are times when you can go on long runs of winning nothing, even with good play (table selection, hand selection, playing to the nuts). I've gone through some long periods where every A2 sees a 2 on the flop, every double suited hand flops the wrong color etc. What should one expect in terms of worse case negative runs before they should start to worry about their play being the issue? I want to be able to remain calm during normal variance so it would help to have an idea of what Omaha/8 can be like during dry spells in terms of big blinds lost.