Just bottled my second one in four weeks, both finished at 1.019. Quite a few of the first batch have gone, very nice indeed, first one took 26 days and the second 18 days so you just have to wait!
The last Nelsons I did (Dec 2018) had a starting ABV of 1.052 and finished at 1.013. 5% ABV it took 19 days in the FV at around 22 degrees, it cleared and carbed in about two weeks but tasted really great after 6 weeks!
I don't think it is that mulled at all, its just a really nice beer that you can tell is seasonal, the flavouring that comes with it says put in on day 4, I put mine in on day 7, you could always not bother with it!
Yes it was slow but possibly because it was pimped up a bit (500g DME), also I was away towards the end of the fermentation so can not be totally sure when it finished, I would guess between day 20 and day 23