Conversation so far:
How often was LL Cool J gone on tour?
Has LL Cool J retired?
LL Cool J had announced his retirement on social media in March 2016, but quickly announced coming out of retirement and that another new album is on the way.
When was LL Cool J's last tour?
LL Cool J and Z-Trip have been touring together since 2011, with future dates planned through 2012 and beyond.

Question: How long was that tour?
Self-contained rewrite: How long was LL Cool J and Z-Trip's tour since 2011, with future dates planned through 2012 and beyond?