Hand Ranges

[MattGN]

I'd really like to start putting my opponents on absolute hand ranges (rather than pulling it out of my - ). I read a lot of "well he's top 30%" and I would like to know how these people are determining this number? I have PAHUD running but please keep in mind I have to last for at least 20 minutes before it gets a read on the SNGs I play (20-30 hands).

Also, is there a chart showing the top 30% of hands? 40%? etc.