I will be away for next month's solar eclipse and need to setup a camera about 14 days before the shoot. I can power the setup with 120v or 9v depending on what is required. My Nikon camera (D7500) internal intervalometer has maximum delay of 7 days. My external intervalometer has a maximum delay of 99 hours. Are there any external intervalometers that I can set up with a 14 day delay? Does the LRT PRO Timer do this, I can't tell from the manual of FAQ?

The LRT PRO Timer is perfectly suited for situations like that because it offers the "Timed TL" mode, where you can define a Date and Time to start the shooting. See manual: https://lrtimelapse.com/lrtpt/manual/

Timed TL:
Allows you to define a start date and time for when the shooting should begin, otherwise this mode works like Timelapse (M) / TL/Astro (B).

Gunther, thanks for the info. Will order one today.