[RadioAstronomer]

This is very seat-of-the-pants, so I'll let RadioAstronomer mop up after me.

Many look at the heliopause (the boundary of the solar wind particles and the interstellar particles) as the edge of the solar system. So how far out is the heliopause? It has been estimated between 80 to 130 AUs. So one light day can be considered in the ballpark. :-)

[PatrickHenry]

Once again, you have enlightened me.

[longshadow]

heliopause: a form of stellar mid-life crisis....