Four days is the answer to that.
Sets the benchmark a bit like the light meter in cricket.

IMO he looks a very good half back prospect with an eagerness to get his hands on the ball which shows his confidence

I read that and put Sinfield's name in place of Lilley's.

Lilley doesn't look slow to me. He's no Ryan Hampshire in terms of pacexecuted, but he's got enough to cause defenses problems, similar to Luke Gale.

Is Lilley any better than for example Scott Murrell when he came through at leeds?

At the time Murrell had mcguire burrow and sinfield all in their prime ahead of him so enevr had a future.

Yes. Next.

That Murrell couldn't make it work at any of his other SL clubs, ending up as a backup hooker at Hull KR, is a pretty damning assessment of his ability.

Is that the same Scott Murrell who made the England squad during his time with the Robins and made one appearance for his country in 2010 (albeit in a friendly)?

Yep, pretty damning assessment of his ability....

Oh yeah, I forgot he played against Cumbria Regional Academy U20s in what was basically an England Knights side. I take it all back.

Still, never looked like getting another gig at a big club after he left Leeds.

Like a number on here I have seen numerous HBs coming through, only to fade into obscurity. Same with hookers. It is normally because they had blistering pace from dummy half which shone at U19s level. Then there are those who are lucky enough to be in the right place at the right time - Deacon at the Bulls, Smith at Wigan - which masks their shortcomings but it is enough to see them get international honours. Brough is a strange one, he didn't explode onto the scene, it took a number of years for him to get noticed. Williams is the first HB, probably since Goulding, to start realising his potential.

Isn't McGuire just as much a halfback? 250+ tries and buckets of winners medals would suggest he's achieved his potential, at club level at least.

McGuire is a just a back up player though isn't he?

Lilley is lucky in one respect that he will be getting a shot in a Rhinos squad that doesn't have Sinny in it what so ever and that Magsy is now entering the veteran stages of his career compared to half backs like Gale for example that had far younger versions of the Sinfield's,McGuire's and Burrow's variety blocking their pathway to the first team

I'd guess that Lilley will get plenty of opportunities next season to showcase his talents in the first team and IMO he's very lucky to be the next cab off the rank and at a very favourable time for him to nail down a half back spot on a longer deal