I haven't tried this myself but thought it might be an interesting problem.
Given two 6-sided dice, and able to write any (single) number on any face of either dice, what is the largest number you can count up to (ie display each number starting from 1) and how are the numbers arranged on the dice?
Assume you only need to show a single value for numbers less than 10 ie 9 and not 09

Nice, inverting a 6 would be allowed.
The practical use is that we have a Christmas thing with dice that count the days down to Christmas, and rather than looking to what they have I thought I'd pose the question here instead.