Depends on your server's specifications, traffic, (LAN) network specifications, method of execution (telnet versus web browser), etc. (times will vary). IF this gives you any idea, takes between 10-15 minutes to check 1,917 links using web browser on a low volume (of users) shared server. ======================================== Buh Bye!
2 seconds per link? Hm, that sounds about right. I've got my code working to check 200 sites in 387 seconds (best time, but varies) on a shared server, medium load. I'm happy with that.
Still, I still want to look into ways of improving this.