[O] Compact timestamps?

[Shérab]

Dear all,

Currently my org-agenda-prefix-format contains this:

    ((agenda . "  %?:t %s")

In the agenda view, this leads to an itme being displayed like:

  18:00......: My appointment

I'd like to aovid the "......" used to pad the timestamp becuase I am
using a braille display so compact output matters much more to me than
vertical alignment.

I din't find any way to achieve this.

Many thanks for any hint!

Shérab.