Depends on how it is attached.
If just glue, then not long.
If that is brass rod poking through the armor, then it has a chance.
The other way to go is to have it be 'break away,' and held on with magnets.
On my Panther, I have the tracks and extra road wheel on the turret and crates on the rear deck that are all held on with magnets.
They have never even been knocked off.

But maybe that has to do with the skill of the driver?