My last two Saturday metcons were WAAAY too long, around 30 minutes each. The "more is better" is an insidious creeper with metcon...must. not. let. it. in...chippers just kill me, as do metcons with total running of over a mile.
Funny thing, I really needed a break this last week due to feeling toasted. I need to listen to myself more and keep the metcons short (really short) and sweet.