If that star is hundreds and hundreds of light-years away (like he said), it will take hundreds and hundreds of years for that star to get the wish (if wishes travel at the speed of light). And it could take another hundreds-and-hundreds-of-years for wish to be granted.
On the other hand, if the first star he sees is Sirius (the brightest star in the night sky), it may take only about about 17.2 years (8.6 years for the wish to get there and another 8.6 years to be granted) since Sirius is about 8.6 light-years away from earth.
If that star is hundreds and hundreds of light-years away (like he said), it will take hundreds and hundreds of years for that star to get the wish (if wishes travel at the speed of light). And it could take another hundreds-and-hundreds-of-years for wish to be granted.
On the other hand, if the first star he sees is Sirius (the brightest star in the night sky), it may take only about about 17.2 years (8.6 years for the wish to get there and another 8.6 years to be granted) since Sirius is about 8.6 light-years away from earth.