[akovaski]

The 4 actually becomes its true form at 40 (read the text below the clock), so what you were seeing was not 48 but rather 38.

[primelens]

Yes. Perhaps hitting the optimum form at 45 would be ideal. So 4 would start becoming clearer at 40 and then start degenerating after 45.

[smackfu]

Or change the motion curve so that it stays in the recognizable state for longer, like 90% of the time.

[dredmorbius]

I'd suggest capping the animation duration. 90% of 10 hours still leaves an hour for the animation.

If you've got an extended clock (days, months, years, centuries, millennia), morphing could take a while.

[frigaardj]

Currently the animations all last at most 20 seconds, irrespective of the transition duration.

[rumbler]

Came here to say this. The "pure" version of each digit should come in the middle, rather than at the beginning, of its interval.