Actually wait, they're closer than I thought
DMUA
Then he noticed a few stars were not like their sisters.
They wavered and danced, as if their place in the heavens was unfixed. Seeing the inconstant lamps reminded Japheth of his purpose.
When he realized the irregular pinpricks of light were less like stars and more like windows piercing the sky, a tendril of nausea touched him. A fell radiance leaked from the portholes, and behind them, dread silhouettes huddled close, peering down into reality.
Somehow, perhaps by mediation of the Dreamheart, he knew the names of the stars.
There was Acamar the corpse star whose immense size sent other stars spiraling to their doom. Caiphon was the purple star, appearing in the guise of a guide point, but he viscerally knew it was capable of betraying those who relied upon it too much.
There was Delban with its ice white glare, cruel and bitter.
Khirad was a star of piercing blue light that burned over apocalypses wherever they occurred.
These stars and many more Japheth saw and recognized.
The warlock blanched. He saw where he had to go if he was to swear a new pact to the nameless entities whose lineage included the Eldest, though he was unclear of the hierarchy. If his broken pact with the Lord of Bats could be called a fey pact because of Neifion's home in Faerie, then he supposed the one he contemplated now could be called a star pact because the entities he courted lived far beyond the world.
-City of Torment pg. 184
Since their place in the heavens can visibly change every year/season, the stars should be under a lightyear away. That or the light is magical in someway. Either way they shouldn't be extremly far away, buuuut it is a bit of an outlier like you said. Although tbf once cast it cannot be dodged, just endured. So its no like anyone scale speed wise.