[pmennen]

Yes, you are in list, so in container, so you can't use Skin Helper property here.

Wow, that's surprising. It seems like these lists are precisely where these skin helper properties would be most useful.

I looked thru the python code in the resources folder for the skin helper looking for the code relating to the hours:minutes formatting but I couldn't find it. Does anyone know where it is?

The change I'm attempting seemed pretty innocent at first, but without the skin helper service it looks like it might be complicated.
I haven't done xml or python programming in many years so I'm probably out of my depth here ... but it's conceivable I might make a take a stab at it.

~Paul