If I take the morning after pill 2 hours after the condom breaks, how efdective is it?

Emergency contraception can be started up to 120 hours — five days — after unprotected intercourse. The sooner it is started, the better it works. Plan B One-Step and Next Choice reduce the risk of pregnancy by 89 percent when started within 72 hours after unprotected intercourse. -Planned parenthood
The Morning-After Pill - Emergency Contraception - Cost & Info (http://www.plannedparenthood.org/health-topics/emergency-contraception-morning-after-pill-4363.asp)