time short training!!

Hi anyone/everyone

Ive been running for 2 and half years and for most of that time wanted a 4 hour marathon (best 4.12) My problem is time. My half and 10k times suggest I can go sub 4. (Best 10K 44.02 half 1.42.30) y problem is time due to work and family I just cant get out for lots of very long runs, although Ive followed the FIRST 3 day prog its not been enough. Ive entered the Robin Hood marathon in Sep and have started my own prog which is as follows.Sprint work mainly 800 repeats at 7 min mileing tempo runs at 7.45 up to 10 K and long runs up to a max of 15 miles (2 hours at 8 min mileing) the plan would then be on the day run 15 at 8 min mileing then slow run/walk the rest.Am I crazy or do you think I have a chance?

To give people hope forgot I posted this, The answer was yes ran a 3.52. Biggest thing its in the head. After the first now have 3 more sub 4 and 4 ultras including a beautiful bronze comrades. In other words

KEEP THE FAITH

MM- Yes I did still run more miles at marathon pace than most would suggest but gives me confidence. Average week 10-15 long sundat 5k treadmill session and a sub 50 10k.

On the day I ran slower than 8mm but it felt slow first walk was at 21 miles which was also 3 hours in. Therefore new I was in and just relaxed. Hope that helps