If photoeye is under covered porch, it will do what you describe
http://waterheatertimer.org/How-to-install-and-troubleshoot-photo-eye.html
http://waterheatertimer.org/How-to-troubleshoot-timers.html#photocell
Otherwise, point the photoeye toward the east
You can disconnect photoeye
Then replace single-pole or 3-way light switch with dawn-dusk astronomic timer ... which lets you set 10-15 minute delay from the internal astronomic clock
http://waterheatertimer.org/Programmable.html#st01
http://waterheatertimer.org/ST01C-program.html
Gene
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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