Classic thinking is last long long run 3 weeks out so you've got two more weekend you could use to build up mileage.
The Bupa Intermediate plan (https://www.bupa.co.uk/~/media/Images/HealthManagement/PDFs/Intermediate-marathon_FINAL.pdf?la=en&hash=F4A0380501A089C507BEB0D3678163170268D408) I roughly followed has long run Sundays of:-
15 miles, 13 miles/HM race, 20-22 miles, 12 miles, 10 miles easy, MARATHON
As Pikfo says, speed/tempo work can be done in first two of those last 3 weeks and the last week is taking it nice and easy.
@Greenbank started
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Classic thinking is last long long run 3 weeks out so you've got two more weekend you could use to build up mileage.
The Bupa Intermediate plan (https://www.bupa.co.uk/~/media/Images/HealthManagement/PDFs/Intermediate-marathon_FINAL.pdf?la=en&hash=F4A0380501A089C507BEB0D3678163170268D408) I roughly followed has long run Sundays of:-
15 miles, 13 miles/HM race, 20-22 miles, 12 miles, 10 miles easy, MARATHON
As Pikfo says, speed/tempo work can be done in first two of those last 3 weeks and the last week is taking it nice and easy.