org-clock-mode-line-total

org-clock-mode-line-total is a variable defined in `org-clock.el'.
Its value is

auto

Documentation:
Default setting for the time included for the mode line clock.
This can be overruled locally using the CLOCK_MODELINE_TOTAL property.
Allowed values are:

current Only the time in the current instance of the clock
today All time clocked into this task today
repeat All time clocked into this task since last repeat
all All time ever recorded for this task
auto Automatically, either `all', or `repeat' for repeating tasks

You can customize this variable.