If you've been, you'll know what I mean. It wafts up from the metro and consists of: blocked drains 30 per cent. something like burnt paper, about 20 per cent.
Guests should have at least four weeks to consider the invitation before the RSVP-by date, which, in turn, is usually one to two weeks before the wedding (ask your caterers when they need a final count).
An invitation suite will most likely need more than one stamp on the actual envelope due to the weight and shape, but it's also prudent to factor in the cost of another $0.45 stamp for the RSVP envelope for guests, if that's what they choose. Postage can easily add another $100-$150 to wedding expenses.