Jumbo. That is a long time to wait for just a synopsis and sample chapters. Here's some stats I've collected personally from submissions of my last effort:
Curtis Brown - 2 Days - Personal Letter stating that their young adult list is closed until November.
Annette Green - 3 Days - Unsigned return slip
Conville & Walsh - 4 Days - Photocopied, but signed, letter
Elizabeth Roy - 4 Days - Unsigned return slip
Juvenilia - 4 Days - Photocopied, but signed, letter
DLA - 6 Days - Signed return slip
Maggie Noach - 7 Days - Signed letter
David Grossman - 10 Days - Signed letter
Darley Anderson 10 Days Photocopied, but signed, letter
LAW - 3 ½ Weeks - Photocopied, but signed, letter
PFD - 5 Weeks - Photocopied, but signed, letter
Eddison Pearson - 5 Weeks - Photocopied, but signed, letter
Caroline Sheldon - 6 ½ Weeks - Photocopied, but signed, letter
There was also an agent who took four days to reply and asked for the full manuscript. This took 8 weeks to read and reject with an encouraging letter, and 7 weeks to read and reject the rewrite.
I'm back at stage one again.
Fun, innit?
Colin M