Exactly how long is too long?

100% up to the user, in my opinion.

Very nice ties on those jigs SK. I recall hearing that 1 1/2 X the hook length is the maximum for tails. I don't know that it matters much with Bass and Crappie as they engulf their prey. On the other hand, When I tie Pompano jigs I trim close to the hook bend due to their feeding habit of pecking the jigs.
Your jigs should be fine but if you start getting short and missed strikes you can shorten them up a bit.
Interesting question though.
When is chenille too long?

100% agree. My style/taste is for a shorter tail in spring, summer and fall. In winter, I go just a little longer.

How ever long you want them, but there are some that like a short tail or what I call short. Personally I think try to keep overall length more to size bait you want! I can't remember right now because I use a part of my vise to measure somewhat and as long as it's not past that point I am good. If using flash I have a spot I don't want that past too and I want my flash a little longer than the tail!

Jigs look good and yes some would warn about short strikes, but I just don't buy that so much unless I am bream fishing!

Skip

Thanks y'all.....
Whaler Pompano is one of those fish I put up there right beside crappie....tasty lil boogers they are....
Skip I've always liked the way you align your tails & they are all the same...
Seems like when I tie each tail ties in different.....

The top jig proved itself on a banking trip yesterday evening thanks to Ketchn for advise on one of his spots......