It is 1:50. but w/ FAA min staffing some FA's jumpseat duties are for more then 1 door. ie on a 747 w/ 9 FA's the purser sits at 1L but has to cover 1L & 1 R and there is only an FA on the UD in JS #8 (across from row 15) which covers both UD doors, And 1 FA at 5R that has to cover 5L too. Now in a true evac those FA would make the best attempt to get to those 2nd doors & have pax briefed as a backup.