That IS a tough course for a ZRL! We had two laps of it as part of an FRR series - the finish was at the last KOM banner, I believe.
Obviously, it's the KOMs that matter - the climbs forward and reverse are similar - important to note that the first ~1/3 isn't timed.
If it's a points race, I'd expect people to go reasonably on the initial bump and full beans on the segment. If it's a classic race, they'll just go all out on the whole thing. Both climbs are just over 5-5.5 minutes from ground level, and the segments 3-3.5 minutes.
The two laps will take over an hour, but just.