Unfortunately on the way to Brussels the Eurostar I was on broke down and we were delayed by 2 hours whilst they tried to solve the problem before giving up and transferring us onto another train.
I did get out for a few beers in the city but did not really have much time as we arrived so late.
Coming back was fine although it was a long day with meetings not finishing until 5pm. I left Brussels at 6pm and arrived home at 11pm.