How much abuse can the Yaris take?

[Marfulion]

Well technically the yaris isnt mine but the car has about 31000 miles on it and 95% of those miles were all me. It is kinda like a company car. I have this car at full throttle almost all the time and I force the downshifts on the auto trans like before every corner. Also every now and then I launch while the auto stick is in "L" and push it up to 2nd right before it hits revlimit, cus normaly it shifts like 250rpms before the redline on "D" and i do same from 2nd to 3rd. So my question is how long before the transmission or the engine goes out if i continue to drive it abusively like that?