Do you have a list of games you own? If yes, either list them here, or go on a site such as Gamespot or IGN and search for them and add them to your list. Some sites, like EGM don't have all the games listed.
As well, how many of those games that you have you beaten?
My Collection - Gamespot
Out of the 170 games that I own (at least from what are listed, I can't remember if there are some missing at the moment), I've only beaten 20. So, I still have 150 games to beat - and some, such as Final Fantasy VII and Final Fantasy XII alone would make it take a long, long time. I'd say at least 10 000 hours for all the games.
Now hour-wise to master all the games, well, I don't even want to think about that.