I was thinking that it was going a bit long before the coda, at which point I heard the recapitulation begin and thought "Oh, good, it is almost done." The coda started shortly afterward, and I stopped paying any attention to it.
He starts off strong, but tends to draw it out for too long with too little, which is by no means a rare mistake. I seem to remember some of Bach's work getting a bit self-indulgent with harpsichord solos, to the point where even Iron Butterfly would think it is a bit over-done.