Granted Archer lost time due to injury and we don't know the lingering effects, but I looked up Bob Feller's BR page and saw that he missed the 1942-1944 seasons to fight in WWII and was released from active duty August 24, 1945. So, after missing 3 full seasons and most of a 4th, Feller made 9 starts in August and September, going 5-3 with a 2.50 ERA over 72 innings (8 IP per start).
Not saying Archer is Feller (he is not even close) but I think that he can throw more than 60-65 pitches in a game when compared to a guy who missed 3.75 seasons and threw very little if at all over that time period.