I might have done something bad…

About me: 20M, 188cm ~180lbs good base fitness

I’ve been running consistently ramping up to over 35km/week in the last few months, training for a 10k race next week. I’m aiming for sub 42 in the race which feels very doable with the fitness I have achieved in the last few months.

However, that’s not the problem.. Yesterday, my friend convinced me that it would be fun for me to join him in running CPH marathon on the 11th of may, to which I basically shrugged it off but thought I could enter myself into the ticket waiting list incase something popped up (I was convinced it wouldn’t).

Long story short: now I’m here, 17 days out from my first marathon and I find my self confused about what I have actually done. I will be aiming for sub 4 alongside him (plan to push last 12k if feeling good) which should be no problem at all from an aerobic standpoint, but the issue is that I haven’t done anything close to a marathon long run in my 10k training block. I’m planning to go out for a 25-30k long run tomorrow to see how the legs react but I’m a little bit worried.

What do you guys think? Is this a bad idea (obviously ) or do you think this is achievable for me. Any tips for a first time runner like myself?

TL;DR: Signed up for my first marathon 17 days before, have a 10k all out race 1 week before. Am I cooked?