Wikipedia tells us that on Skylab 3 a total of 1,084.7 astronaut-utilization hours were tallied by the Skylab 3 crew and that a total of 6,051 astronaut-utiliza

Wikipedia tells us that on Skylab 3 a total of 1,084.7 astronaut-utilization hours were tallied by the Skylab 3 crew and that a total of 6,051 astronaut-utilization hours were tallied by Skylab 4 astronauts. So it's fair to say that either NASA completely changed the way they measured "astronaut utilization" between these missions, or the Skylab 4 guys were flying a very different mission. We're comparing a 60 day mission to an 80 day mission, but still.