Is it possible to make a “hot bar timer”?
Here is an extremely easy way to do it that looks natural: The XP Bar. Basically you use the /xp command:/xp 120l @a
Then have a repeating command block and set the tick delay to 20. In that put the command /xp -1l @a That will now take one xp level from every player. Then if you want to test when it hits 0 you can either have a scoreboard system run alongside it OR have a block testing for /testfor @a[l=0] and when that is true the timer has reached 0.