My screensaver only runs for a few minutes and suddenly stops when I want the screen saver continue until I start using the machine again

My screensaver only runs for a few minutes and I would like to be able to run for at least 30 min.

Besides from Checking the the obvious System settings in >Energy, >Screen Saver, >Wallpaper, >and Lock Screen sometimes the option to have this beautiful Cityscapes screensavers provided in Sequoia, (with movement) still does not keep the screen saver on rollin, and it was a nightmare for me until I discover that if in the Control Center you have the Focus settings and some settings on Sleep, this setting provoque that the screensaver only works for 60 seconds so when you turn of Sleep, in focus the screensaver can be in your screen whatever you want to, or until you restart your activity in the machine. Hope this helps someone.