Thank you for the prompt reply.
I saw the status change first, then the certificate posted.
Even though I already have sufficient nights for Lifetime Silver I care about these nights because I am within stretching distance of Lifetime Gold, which looks as if it would actually be useful. However, not sure I can bring myself to divert any significant amount of spending to this card at 1 point per dollar.
Do I understand correctly that holding more than one Marriott card does not result in more 15 nights credit?