10th
Periodic Review Lists
I recommend borrowing a concept from Sciral Consistency and put things into periodic review lists. @waiting, @waiting-weekly, and @waiting-monthly. This will take the somewhat distant items out of your immediate list, and force you to review things that are farther in the future from time to time.
When the time comes to pull it off the @waiting-monthly list and put it on the @waiting list, you can do that easily and it won’t be cluttering your @waiting list before it actually has to. Your @waiting list is uncluttered, and you’re still tracking things that you’re waiting for months from now. Problem solved.
If your life is much more complex than mine, you can create lists for future months @waiting-january, @waiting-february, etc. so you don’t have to review too many items at the end of each month. This is an added layer of complexity (finding a distant item now requires searching through 12 lists), so I only recommend it if you spend “way too much” time on your @waiting-monthly list each month.