Max mileage per week HIM

What level did you put yourself at?  What pace did you put in?  If you choose level 2 or 3, it will give you some overdistance, especially if you are 'faster'...though it depends on your pace.

Better yet, if you can attach a screenshot of the 'view plan' top part with all of your inputs, that would be easiest and I can look at it.

Note, the advanced Silver HIM plan has a few 5 hour-ish weeks too with a run nearly 3 hours...this may not be unreasonable, though I would like to see your defaults to be sure.

Yes, thanks.  I did recreate the plan.  Being and advanced plan and assuming FOP, it does put in some overdistance training hence the volumes you saw.  If this personally doesn't work for you, or you would like a lesser run volume, there are 2 easy things you can do:

1 - Change it to an Intermediate plan, this will primarily lower the volume overall.

2 - Keep it 'Advanced', but change your run pace from 8min/mile to 9 or 10.  If you do it 10min/mile, you will see that your run volumes has you peaking at about 14miles for your long run instead of 18.  If you put in 9min/mile it will peak your long run about 16.5 miles.