Kenno - You can get back to a decent level of running fitness quicker than you think. I had close to three months off running last year after breaking my foot and getting back out hurt, but after a few weeks I could certainly feel a difference.
Funnily enough it was in Amsterdam I did my first run after breaking my foot. A very gentle jog around Vondel Park the day before the marathon, which I had to DNS due to the injury.
I ran a local 10k this morning. Bad day at the office for me. I was feeling really run down and lethargic as soon as I woke up this morning. Tried to give the race a good go, but was struggling through the first 5km and then suddenly felt good and pushed hard on the second half of the race. Finished in 46:13, which is over a minute off where I'd like to be.
Been feeling a bit ill since getting home, probably should have skipped that one.