Just for info for others, I took 5 logs to Mark for him to mill for us last year so an hour or so of that time was that, and the mill still looked in extremely good condition despite being a few years old, although he had to pull start it each time as he'd dropped a spanner across the battery terminals when checking the thing still ran as he'd not used it for ages.
A couple of months later he asked if we'd be interested in buying it and we agreed a price of £3500, knowing we were paying a premium for a mill with little use. However he then withdrew from the sale as he couldn't face selling it. We ended up investing a bit more and bought a brand new HM130MAX and decided in the end that we were glad we did, not just to have a new mill but also that it would have taken a lot of effort to dismantle, move and rebuild it in the woods.