The tung oil I've used doesn't dry faster. In fact it takes at least 24 hours to "dry to touch" and at least a couple of months to harden to the point of beginning to provide "the tung oil surface."

There are numerous varnishes with a small amount of tung oil in them, and lots of those are pretty quick-drying. They may benefit some from the tung oil content.

A "real" tung-oil finish - nothing but tung oil - is virtually invulnerable to water marks, stains, dried crusty spills, spilled medicines, hairballs, and other "piddles-and-crud" but it's not a quick finish.

I had to "re-finish" a table once when a g'kid left a wet glass on it after about three weeks of "cure," but once I got a month or two of hardening on the second pass it hasn't been touched - and seems pretty much "untouchable" - by any of those things that spoil fine furniture, for a little over 20 years.

(Maybe I should give it an oil job just out of sympathy for the abuse.)

Pure tung oil, on the other hand, is among the more expensive materials you can use; and since it hardens to an incredibly durable (hard?) surface I'm not sure it's what I'd think of first for the finish on an instrument. A more conventional varnish with "some tung oil in it" would be worth considering though.

John