I was too lazy to count all the minutes they've played in international tournaments so i'll just list the amount they entered.
international comps:
Lebron - 5
Kobe - 2
MJ - 4
KG - 2
* note: besides LeBron, all the minutes are totaled from the end of their ___th season.

LeBron has played slightly less than 1000 minutes in the last few playoffs, so with the last few games left this season + playoffs LeBron should hit 40,000 career minutes and be around 29 years, 200 days old when the season is over.