Acceptable Swings?

[CJHunt]

Okay we all have swings but what is considered to be an acceptable level of "swingyness"?

I find myself going on nightly 60 BB swings playing .5/1. I usually start out bad and drop 50-80 BB and near the end of my night come back.

Are daily swings this large out of the ordinary?

I am winning overall but it does seem that almost nightly I go on huge swings and start to question myself. Any ideas?