Edit Animator Transition Conditions At Runtime

I was wondering if it was at all possible to edit an Animator I've created's transition conditions at run time. This particular Animator has 5 states that all transition from the previous to the next in a very linear way. I'd like to share this Animator with several different Game Objects and have each of them have a different exit time while going from the fourth state to the fifth state.

I would not like to use any solution other than modifying the exit time during the transition from the fourth state to the fifth state. Please do not recommend that I use variables in conjunction with scripts.