Jersey Giant Questions

[Agricola]

I am thinking of getting some Jersey Giants but I have a few questions for those of you who have raised them. I know they take longer than other breeds to reach their full size, but do the hens start laying around the same time as others (20 weeks or so)? Do the roosters start crowing as early as other breeds? As far as when they reach a decent table size, most sources say nine months, but some say eighteen months! What has been your experience?

Thanks!