abigail

abigail - a personal assistant for the RTC shell.

proof of concept-ish rude and crude demo

It will break your fancy-shmancy DVTM status (well, I'll eventually copy mine from dvtm-status into this script, I guess..). It doesn't show the elapsed times in tmux yet, but the change is actually trivial (just additional output into a textfile, and something like set -g status-left ' #(< /tmp/abby.timer) in tmux's config...)

$ ./abigail start

$ ./Tmux
or 
$ ./dvtm-status

$ ./abby +5minutes ## reminder in 5 minutes
or
$ ./abby 16:20:00 Twenty past four PM

The 'abigail' process will run until stopped with 'abigail stop' (it survives the logout as well!)