When does a move from something that is an active project to a someday / maybe
I mean, suppose you have a project that you start but then other things take priority or you just do a small action on every now and then. At what point does it become a someday / maybe?
How long between planning and starting or how long between actions means that it should move from your current projects to someday / maybe list?:)
It depends on how well you do your weekly review.
There are really two extreme answers to this question. On the one hand you can ask yourself "if I only had that context available and I had all the time in the world, would I still care enough to do this?" If you answer no to that question then it should definitely move to your someday/maybe list. At the other extreme, if you regularly review your someday/maybe list during your weekly review then you can feel a lot more comfortable giving yourself permission to put things on the someday/maybe list cause you know you will have the opportunity to move it back to your action list next week if you are ready to act on it then.
Between these two, I recommend the latter. If you there's no way the opportunity will arise in the following week to act on it (because the context won't be available or because you don't care enough to act on it in the following week) then move it to your someday/maybe. If you do your weekly review properly you know you'll have the opportunity to reassess the situation next week.
I hope that helps.