One main gaming one and login for important things.
Two old ones I use for gaming logins/spammy mail senders.
An official one.
A university one.
Then a random one set up through my previous school years, so 7.
I have most of them on Hotmail, so they are all accessable via login of one of them. Plus I have them all forward to my main gaming one that I have connected to my phone and ipad.