Randy - this is how you do it. Get up early and start hiking at 7AM. Old guys like us can easily average 2 miles per hour with a reasonable load. Try to have around 10 miles by noon then stop when your sick of going any more. You’ll get all the miles you need and still have some time to kick back in the afternoons. We didn’t take any days off, and the 29 days includes hitching into Salida for a new water filter and into Silverton for a burger. Other than that, we were supplied by friends who met us at trailheads every week or so. (That will save a lot of time if you have someone who will do it)
After you’ve been out a while you will realize that if it’s 3 PM and you’ve had a great day that you might as well keep on trucking until 6 and turn it into a fantastic one. You will be amazed at how much better you can do than you envision.
16 miles a day is nothing compared to what some of the younger Golite crowd does - you’ll get passed regularly by the really fast ones. I carry about a 20 pound pack before food and water - usually 30-31 pounds when its full. Keep it light as you can and you’ll get better mileages.
Feel free to send me a PM if I can help you get organized. I think I have a gear list somewhere…
bearcreek