How to increase tmux pane numbers display time `ctrl-b q`

The command to do this is join-pane in tmux 1.4.

join-pane [-dhv] [-l size | -p percentage] [-s src-pane] [-t dst-pane]  
    (alias: joinp)
    Like split-window, but instead of splitting dst-pane and creating
    a new pane, split it and move src-pane into the space.  This can
    be used to reverse break-pane.

To simplify this, I have these binds in my .tmux.conf for that:

# pane movement
bind-key j command-prompt -p "join pane from:"  "join-pane -s '%%'"
bind-key s command-prompt -p "send pane to:"  "join-pane -t '%%'"

The first grabs the pane from the target window and joins it to the current, the second does the reverse.

You can then reload your tmux session by running the following from within the session:

$ tmux source-file ~/.tmux.conf

You can configure this with the repeat-time option:

repeat-time time
Allow multiple commands to be entered without pressing the prefix-key again in the specified time milliseconds (the default is 500). Whether a key repeats may be set when it is bound using the -r flag to bind-key. Repeat is enabled for the default keys bound to the resize-pane command.