backspacing

Another pause and more frantic backspacing.

The keys puttered steadily, click-click-click, pause, click-click-click, pause, punctuated by frequent backspacing and curses.

If you forget to allow for the backspace time, you may find that this time margin has been reduced noticeably - the pan may even start before the backspacing is complete - and this will not look good on the screen.