When we went in February we had a 36 minute connection at Lille, but our train from st pancras was late so we missed it resulting in a wait of over 1hr 40mins for the next train, then on the return our train was late out of Marne la valee and despite a 40 minute connection time , the lateness if our train ment we only just made the Eurostar from Lille , we literally had to run fom one train thought the station and check in etc and only just made the train jumping on any carriage before it left.
That was the Last train back to uk that day, and I really didn't fancy being tuck in Lille!
The weather was very cold which was the reason given for delays, so it's an unusual circumstance, but definitely the most stressful journey I've ever made!