Ziffa and VM are correct. Bees will take up new jobs younger, or revert back to their old jobs, whichever the hive demands.
If you started on the 16th or 26th, and the queen laid for 6 days before stopping, then 21 days for the last eggs to emerge, what date does that bring you to? Right now you still have emerging bees unless they absconded and left the rest to die. Then they need a week or so before being old enough to fly. I say 6 weeks bare minimum, maybe longer if they are still leaving the cone. One week minimum after the last one is seen exiting the cone.
Once the cone is removed, check the bees going in the tree for pollen. If pollen is going in, the queen is still there. Replace the cone. Robbers do NOT carry in pollen.