The someday/maybe list is an integral part of Getting Things Done. It's where things go when you might want to do them at some point, but now is not the right time.
It's a really useful tool, but even with regular reviews it can get pretty darn large. My list is around 250 items, but that doesn't include things like books I want to read, games I want to play, random ideas I've had, etc. It's probably closer to 500-600.
All of these items range in size; there are things I could do in an hour, tasks that would take months - or even years - to complete, and everything in-between. It's a little overwhelming to look at it all in one go.
One thing that stood out is that I have a pretty decent handle on the someday part of my list, but I'm struggling with the maybe side.
There are a lot of things on the list that I'd really like to do. There are also things that I'd like to do, but that are outside of my current abilities. And there are also things that sound like a good idea but are probably not so great.
Even if each item only took a day, it would still take me nearly two years to get through everything. If each item took a month it's closer to 50 years. Ouch.
Right now I'm trying to accept that maybe not is a part of the someday/maybe process, and that most of these ideas will never come to fruition.