Started a new game on GTA IV, finished the story mode (with Revenge ending), did all the random encounters, all Stevie's car thefts, did all the most wanted missions, etc. Pretty much did things only relevant to the story.
Then did TLAD and TBoGT, then finally, GTA V (not 100% though). I don't have China Town Wars or I would have done that too. It took about three weeks.