I can't remember the book (maybe one by Egan?), they transported the endpoint of a wormhole to its final destination with a normal slow spacecraft and then star

I can't remember the book (maybe one by Egan?), they transported the endpoint of a wormhole to its final destination with a normal slow spacecraft and then started using the tunnel for FTL. I guess the crew used the wormhole all the time to refuel the ship and to go sleeping at home :-)