It would infinitly more saddining if some one was to actually give the stack limit of kronos from experience
With the amount of farming and the reasonably cheap price of krono on TLP, I'm surprised no one's asked if they stack to 1000 heh.
If you have to worry about something like that, I'd say you definitely should be re-evaluating your priorities.
The answer was given from experience, but to be fair, I don't trade exclusively for kronos so a majority of my money is in platinum.