Afan W2 is roughly 30km with 975m, I was out in Rostrevor and managed 27Km with 1250m climbing with a range extender and still had some juice left at the end. https://www.trailforks.com/ridelog/view/49008500/
Bike was in 60 / 100 for 90% of the time and in 100 / 100 for 5% of the time.
My bike is heavier than the standard Levo SL, running a Fox 38, deemax wheels and Argotal tyres. If you're on a standard SL you should get an extra 10km no problem.
I did W2 with a 700W battery and just about made it back. That was using 40% most of the time with a little 100%.
Others we were with were similar usage.
hey mate..... i'd be a bit careful, full w2 is more like 40-45km, not 30km stated above. The full w2 is with "the wall" and "whites level" combined (its a great XC loop with some enduro-ey descents, nothing too bad though).
I've done W2 many times on a ff levo with both 500w and 700w battery, there was plenty left in both without being too miserly with power modes.
The other thing to be mindful of is that lots of "the wall" has been closed recently due to logging. I ended up doing skyline the other day (52km) as large parts of W2 were closed. Hopefully its all back open now though.