Hi again everyone.
After sleeping on it overnight, and damned uncomfortable it was too, I have decided that a simple PAUSE 15000 would be good enough to give me my 15 sec. maximum time. As long as the accuracy of PAUSE is reasonable it will be good enough. After all, I ain't launching rocketships, just turning pistol targets.
Time to read the manual and check out how good PAUSE is.

Better late than never.
Regards,
Peter