Unfortunately it seems manufacturers just haven't made bats smaller than 27" for the USA standard very common. We wouldn't be able to definitively say how long a tee ball bat would last in coach pitch, since it is designed to hit stationary baseballs. Personally I think the new USA standard somewhat helps in this situation, as the walls of the bats under this standard will be thicker than the old USSSA standard, so that would help with durability.
The 2018 Easton Ghost X -13.5 USA Tee Ball Bat: TB18GX135 is only designed to hit ball off a tee, so it would not last long in coach pitch. A coach pitch bat I would suggest would be the 2016 Easton S3 Junior Big Barrel Baseball Bat: JBB16S310.
We do not recommend using any tee ball bat for anything more than hitting off a tee. Therefore, using the 2018 Easton Ghost X -13.5 USA Tee Ball Bat: TB18GX135 for machine pitch is not recommended as you will certainly run into durability issues down the line. I would recommend checking out the 2018 Easton S450 -12 USA Youth Baseball Bat: YSB18S450 if you are looking for a lightweight USA bat to use for machine pitch.