If you haven’t noticed, there are now added search features in the custom drop-down menu of the Foundry’s search. Not only can players specify a desired mission duration, or a list of only 4-5 star missions, but also authors can now use this feature to determine the average play-time of each of their missions.
You can discover which of your missions classifies as 20-30 minutes, 30-60 minutes, 1 to 2 hours, and 2 hours+. You may also have a mission that doesn’t qualify for the wrapper, yet does have an average time of 20-30 minutes. The reasons for this classification are unknown, but it seems to point to something other than simply the average time as a factor in whether or not your mission counts for the daily.
To access these additional options, click the drop-down search and specify “custom” instead of “top rated” or “hot.”