You already know the amswer to your question. You have to do 3 things, wait, wait, and wait. How long depends on the thickness of the lacquer, the temperature and humidity in the area where it is waiting, how aggressively you use the buffing wheel, and how high a gloss you are willing to accept.
If it were summertime in a dry climate, you could buff the next day if you don't get too aggressive with the buffing wheel. But we are getting into that time of the year when all finishes take more time. The shops are colder, and everything slows down.
A good "rule of thumb" is to give it a week, but 2 would be better; and don't be surprized if it tales 3 if the shop temperature gets below 50F at at night.
The only way to really know "how long" is to try some different lengths of time to find what you can get away with. Don't be surprised to find that it takes twice as long now as it did last June, unless you can leave the finished pen barrels in the house. Under a box on top of the hotwater heater is a good place.