Graphene only supports the same time frame as Google, 3 years from launch for the #a series models. Calyx goes about an extra year. I really got hosed by not reading the fine print, I just bought Google 5a, and it runs out of support in a year now, its a 5G phone, I'll have to use Calyx or Lineage OS to go beyond. I wish I had just gotten an LG V50 or V60 and gotten better audio quality and a nicer screen.