Boris has responded. It's a little bit lengthy so we might have to turn it into an article. One quick thing is that when considering monthly load the period is important i.e. prep or comp. So generally you take your yearly load and divide by 12. Some months will be high loads while others will be low loads, the same way daily and weekly load works. Doing this calculation for the <80kg and >80kg templates, assuming run back to back all year, you get 880 and 630 monthly NL, respectively.