I put on the tung oil and let it sit for about 15 minutes.  However the end grain sucks up the oil like crazy. So I keep Appling the tung oil with a foam brush pretty heavily during the 15 minutes.  Then I wipe the doors and drawer fronts down really good.  Then I let them sit for 24 hours. I rewipe them to see if I missed anything which I didn’t.  However if I did it would have been a little sticky.
so after wiping the second time I took 220 Grit and very lightly went over each piece.  Then I blew off and wiped.  Then I reapplied the tung oil and followed the same steps.
Now this is my work bench so I only applied two coats. If this was a door or drawer front for a kitchen,  Etc.. I would have done 4 coats with sanding in between.
Jeff Vandenberg aka "Woodsconsin"