When I read this post yesterday morning I had the same thought as Dave and Maydog and if that were me doing this challenge I would probably fail first from saddle sores before my legs gave out.
Mainly because I have struggled with this issue enough in the past and have learned from experience how to deal with it a little better. Do I have it solved? Not even close, but I have taken some steps to help manage it during the ride/training, post ride hygiene and clothing circulation.
Some of my experience I posted on my blog in 2011 when I started increasing my training time and when I formed a peanut sized lump in the crease of my leg that I thought was going to require surgical removal. Fortunately the doctor I was referred to visit was a cyclist that does over 200 miles a week himself and knew exactly what needed to be done. He also gave me a clue on a pretty good chamois crème that is low cost compared to bike specific crèmes.
Here is that blog post and it is the probably the #1 post that gets the most hits from people searching the web. It may not be the best written or have the best advice, but it just goes to show how many cyclist are out there struggling with this issue.
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The cool thing about this challenge if you are really serious about it is you will gain experience on how to manage, cope, adjust, pick the right clothes (shorts), crèmes, post ride hygiene, etc. as you put more hours on those legs if you start now. Start increasing the weekly saddle time now since it adaptation takes a while. With this increased saddle time you will get a better feel as how to well the crotch and saddle area is going to hold up.
You mentioned a gel saddle and I am not sure if you are talking about one of those gel comfort saddles found on newbie cruising bikes, but most that do a lot of miles will tell you that the more comfortable saddles for long duration happen to be the ones with minimal padding and generally look like they would be the most uncomfortable in appearance.
For instance my saddles that I find work for me the best are the Fizik Arione and the Cobb V-flow Plus and to look at either you would think they would be the worst. However, both are very narrow in the nose area and my thighs and hamstrings do not touch the saddle, but my sit bones are well supported. It is the pad in my shorts that makes up the lack of padding on the saddle. My preference in shorts has become the Desoto, but that too is something each of us has to determine.
Speaking of finding the right short and cycling daily is to have a good supply of the short/bib you find to work well for you in this challenge. I find it is good to have a supply to keep in circulation especially since we wash my shorts/bibs and then let them air dry to increase the life of the short. (Some of the shorts are not in this picture since they were in the dirty laundry)
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My wife has been super supportive that she puts up with me training a lot of hours when I am not at work and she is the one the is washing my dirty bike clothes while I am training.
Best wishes on starting this journey and I think if you start increasing your training time now you will start to form your own path on managing all of these issues and get a feeling if this goal can be achieved. I think it is a pretty cool challenge. Keep pushing forward.