It doesn’t hurt to attempt it.
I’m similar net stats to you, meaning I don’t know your build and importantly for running your body fat.
VO2 numbers I don’t care for.
And unless you build your training to 20 plus miles at your expected race pace, I don’t think you can gauge your 50k performance.
Also the idea of a slow pace to complete 30 miles means probably cramp and tighten around the half-way point and your walking pace will increase beyond what you anticipate.
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