Brussels to Deep into Turkey by train, crossing Belgium, france, and Switzerland, and doing basically most big cities from Slovenia, Italy (+free boat), greece and turkey, ending with a one way Istanbul - Tel Aviv in economy, with costed at the time 88,000,000 Turkish lira (the flight took 1:10 mins).
The whole story took 27.5 days, but Im not sure if its fair to calculate days when I was just sightseeing.