If we believe the Cacti graphs, over the past several weeks the Montréal QIX peaked at 50Gbps[1]. Your comment implies that the QIX might be running over a mere 40Gbps link, but presumably their aggregate link capacity is (much?) higher than that.
That's 40gbps of voluntary (technically settlement free, but not in the usual meaning of the term) peering, not paid transit. Paid transit numbers are several orders of magnitude higher, and total traffic numbers are unknown.
