Sun Light takes 1,000/30,000/100,000/170,000/1,000,000 years bouncing around inside to then reach the Earth
When Light (Photon Particle) is generated inside the Sun , it takes a long time to bounce around inside , to later escape and travel outward.
Neutrinos escape immediately.
The numbers for the years trapped inside vary too much. I have included some numbers in the title of this Question. Here is a selection of online articles which I got to highlight the numbers :
https://www.wwu.edu/astro101/a101_sun.shtml :
Energy produced in the form of light keeps bouncing around inside the Sun, as though the Sun were made entirely of mirrors. 840
A particle of light can take more than 30,000 years to reach the surface and escape!
https://futurism.com/photons-million-year-journey-center-sun :
It can take anywhere from a few thousand to a few million years for one photon to escape.
https://www.symmetrymagazine.org/article/august-2014/first-measurement-of-suns-real-time-energy :
Borexino scientists found measurements using solar neutrinos matched previous measurements using photons, revealing that the sun releases as much energy today as it did 100,000 years ago.
https://en.wikipedia.org/wiki/Sun :
... Process converts 4 million tons of matter into energy. This energy, which can take between 10,000 and 170,000 years to escape the core, is the Source ...
https://en.wikipedia.org/wiki/Sun#Sunlight_and_neutrinos :
Estimates of the photon travel time range between 10,000 and 170,000 years.
https://en.wikipedia.org/wiki/Borexino :
... solar activity has been consistently stable on a 100,000-year scale....
(1) Why so much variation in Estimates ?
The Borexino Measurements Directly use this Number to compare/estimate what the Sunlight would have been X years ago, but the Specific number used is 100,000.
It is one thing to report widely ranging numbers , it is another to use a Specific number in calculations to make conclusions.
Like-wise , there are calculations on when the Sun will expand or when the light will Dim out , again using some Specific number given here.
(2) In this Case , why do Scientists not calculate with lower bounds & upper bounds , choosing to instead take a Specific number ? 840