How long do i have to press the space key to stop disk cheking

I started the tune up thing and then same shit happens with my pc and now im trying to cancel it, but how long do i have to repeatedly press the space key

Hello Beth,
We do understand your concern, we apologize for the difficulties.
Let us know if you are using our paid version or free/ trial version of AVG.
Please be more specific about your request, are you facing issues with disk doctor or disk defragmentation?
If possible, kindly provide us with the screenshot http://avgclick.me/getscreenshot of the issue on AVG user interface.
Thank you.