u/z3115v2

Training for first 50k in early Nov. I have a rough plan based on modifying/combining plans I found online. My plan peaks at 42 MPW with a long run of 18 miles (running 5x / week). That equates to 43% of my mileage that week. Is that a bad idea? I'm trying to reconcile the following three pieces of "conventional wisdom" that don't seem to mesh:

1. You only need ~30 MPW to finish a 50k
2. You should try to have at least one long run in the 18-20 mile range
3. Your long runs shouldn't be more than 30% of your weekly mileage

I could reduce my long runs and add miles to my other runs to keep the same weekly mileages, but am I going to be in trouble if my longest training run is ~14 miles?