Code:
alias blabla1 {
  window @pre-time
  set %timeremaining 10 
  .timerblabla 10 1 dostuff
}
alias -l dostuff {
  dec %timeremaining
  if (%timeremaining) { .aline @PRE-TIME This window will close in: %timeremaining seconds | return }
  window -c @PRE-TIME
}