Can't answer for now. Joined about almost 3 years ago on 777 and did one blindline before remaining on triplines. Could get at least a couple of Sat or Sun off an sometimes a weekend. Current month 3 years later with about 100 junior have 3.5 weekends off.
Its not that bad and gets better with continued recruitment onto the fleet.
When I last looked the 777 has 16 3xpilot destinations (so 50% chance of a landing) and 12 2xpilot destinations (so 1 landing). Also have 4 destinations with a shuttle flight eg LGW-BGI-POS-BGI-LHR, so 2x landings and 2 destinations that alternate between 2 pilots and 3 pilots between summer and winter.
And just to be complete one destination with 4 pilots and 1 landing each (because 2 pilots get to fly on to another destination and back)
Also not all destinations are served every day (some of the 3 pilot trips) and some destinations are served several times a day (mostly 2 pilot trips but the odd 3 pilot trip)
Conclusion= landings are not on issue