My buddy had this issue, heres his timline of recovery.
October 2012 - Had his hamstring put into his left ACL - Mad rehab and shit for that knee but they cant do both at once because then you cant walk and rehab properly
February 2013 - Had a dead guys ACL replace his ACL - Mad rehab and shit
August 2013 - Should be able to start waterskiing and potentially wake boarding
2013 - 2014 - Good to go for the ski season.