The 2.035 length is the maximum you should let it grow but even that has a fudge factor built in. If you did a chamber cast you'd see the neck section probably allows for 2.045 or even 2.050" case length. Don't quote me on that but the few factory chambers I've cast and measured all allowed at least another hundredth or two breathing room. Unless you're a masochist and just love trimming
, you can wait until they all get to be around 2.035 or even a couple-three thousandths over that and then trim them all back to 2.025". And don't worry if you trim them back to 2.022 or 2.023, that won't hurt anything either.
I recently messed up with some .25-06 brass that has a max case length of 2.494" and a trim-to length of 2.484" I neck size which helps reduce case stretching a lot so I forgot to keep track of this particular batch. When I finally measured them they were all at 2.510" or thereabouts and some were even 2.515", but they still chambered and fired cases did not show the pinched necks which is the tell tale sign that your cases have grown too long.
Anyway, definitely
not recommending someone let their cases grow like that. Best practice is to trim them before they go over that max case length, but just to say that in a factory chamber there is no major catastrophe waiting to happen if your cases are a couple thousandths either way of the max recommended case length.