Training for London Marathon 2

According to my 18-week marathon training programme, I was slated to run 26km yesterday.

Last week I did a 33km run and felt alright. So I thought I would repeat the same route.

Instead I did the same route plus a little more. Only thing, I didn't bother stopping by for groceries at Sainsbury's. I continued running home. I finished 36.82km.

Total time was 3hrs 20mins.

Now I am caught between being hopeful and hopeless of achieving a sub-4(hour) finish for the London Marathon.