Well, nothing can stay on the shelf forever and not change. Rodinal goes too. But, why stay with dilution B? You can go to a higher dilution if you want a longer time, HC-110 is remarkably consistent over a wide dilution range. I long ago switched to using ratios that I could mix without thinking too hard. 1:50, 1:75 etc.
I have considered that and perhaps I need to try it.