Greg:
Travis Clark and I climbed Mt. Massive about 12 years ago. It is a long days hike by the time you summit and come back down. The fact of the matter is, we thought we were climbing the route to Elbert but ended up on top of Massive. It was in June if I remember right and there was lots of snow pack toward the top.
We were definitely off the beaten path as I remember climbing through scree piles and actually doing some bouldering. Somehow, we had ended up on the west side of the mountain. Once we found the summit, I remember opening the sign in cannister and found out we were on Massive. I yelled over to Travis, "Hey Travis, does that mountain over there look like it is 12 ft. taller than this one!" We found the main trail for the return trip and it was much easier. I was along for the hike and hadn't did any "scouting of routes" etc.... It was something to do on a day off from riding so we weren't exactly "doing it by the book!"
I've never done Elbert but I've been told that it is one of the easiest climbs of the 14ers. More about conditioning than technical ability.
You climb a little over 4,300 ft for massive and I think the round trip distance is about 16 miles.
Just put a pack on and start at the campground loop and hike to the top and back. That would put you in the range of mileage. Just no altitude to deal with. Make sure you raft the Arkansas River while your in the area. The most popular trip is "Brown's Canyon". Back in my whitewater days we used to paddle: Pine Creek, numbers, and Royal Gorge sections of the Arkansas. If you drive past these sections in June, you'll see some real white water.