I've been known to count to myself rather than set the included signal timer on my strictly manual heat presses.
My favorite in an old Insta which has a mechanical bell!
I'm presently fighting some cap patches, that when I follow the guidelines for temp and time, are still hot enough for the damn patches to become unstuck and pop off if the caps are disturbed.
No mention of a cool-down period that I had to learn on my own.