I got this diagram from https://www.instructables.com/10-Year-LED-Flasher/.
There is another from https://www.hackster.io/simpletronic/10-year-led-flasher-398282 but I tried on breadboard and it didn’t seem to work.
The obvious difference is the lack of a diode 1N5819 in the later.
This circuit is supposed to light an LED bulb for 1/1000th of a second (1mS), every second, for 10 years, using an AA battery.
If you switch the AA battery with a D type battery, which carries 10 times the charge, it may blink up to 100 years, provided that the battery doesn’t deteriorate sooner.