I have been told (not that I really bvelieve it) that my introductions to songs are the reason my sets run so long. I, too, play a number of instruments, but in a situation where time may be fleeting, I don't take 'em all onstage, and don't use too many tunings (I don't do many guitar tunings, though I have been known to do a set exclusively on banjo, with each tune or song separated from its predecessor by one or two frets on one string).

Examples of such tunings (with a different song or tune for each):

gDGBD --> gCGBD --> gCGCD --> gDGCD --> gDGBD --> gDGAD --> f#DGAD --> f#DF#AD, etc.

Now, this doesn't take much time between songs to retune, one note on one string at a time. But it does take planning.

For some reason, mostly, in fact, at NEFFA, we end up with one song more than we can fit into the set, no matter how few songs we plan to do. That is discouraging.

But at least we don't do the prima donna thing.

Bob