Stopwatch time in markup

[Tom Hall]

Hello List

I want to print stopwatch timings in a score, surrounded by a little box. I've
been through the help files and the archives of this list, but since quotation
marks are special characters, it's not straight-forward and I've not managed to
get this right.

I'm aiming for somthing like: 

 -------
| 4'33" |
 -------

The closest I've managed is below, but that results in 2 boxes, one surrounding
4' and the other surrounding 33".

Any ideas how to get what I'm after?

Regards

Tom


%%%%%%%%%%%%%%%%%%%%

\version "2.12.1"

{
  \mark \markup{ 
  \rounded-box \small { 4'"33\"" }
  }

  c'2
}

%%%%%%%%%%%%%%%%%%%%