Remember that there is another time. Late in the program is too late to insert an unscheduled long run. You are better to arrive at the starting line rested than having squeezed in the exta 20-miler.
European running programs often focus on 30 kilometre runs rather than 20-milers. Why? Both are nice round numbers that look big, but there isn't that much physiological difference between running 18.6 miles (i.e., 30K) and running 20.
At this stage, complete your planned runs, enjoy the marathon, and take time for recovery. Then you can come back and experiment with a different training approach if you want to. If you were to look to the classic Galloway program, your long run would be even longer than the marathon. There is no one right solution which fits everyone. Enjoy the experiment and keep learning.
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