I know this gets asked all the time but can someone please advise me of the timing for invites?

I've seen many articles advising to send out invitations 6-8 weeks prior to the wedding. This doesn't seem enough time for me as I'm wanting to organise place cards, printed seating chart etc not to mention I'm sure I'll be chasing people up for RSVPs! My wedding is early November so I'd love some thoughts/advice. Thanks!