I try to avoid the temptation with time as a total indicator for what my possibilities are for the marathon. It's the not the best indicator, but it's more how you feel, how you cover the distance and how you are able to do the training afterward.
“Like a plant that starts up in showers and sunshine and does not know which has best helped it to grow, it is difficult to say whether the hard things or the pleasant things did me the most good.”