I never had that happen before.
avast!, I love you! :-*
It isn’t unusual as there is no set number, I have seen 5 in a day with avast 4.8.
One of the ones today was to correct a problem with the Pirate Talk language module as far as I’m aware.
Check the avast! Virus Update History 2010
Yes, after reading about the Pirate fix, I gathered that.
I have never seen more than 3 updates in the past but I don’t check to see how many I have gotten very often.