Not much. It will probably take about one to two weeks to organize and execute an order. Something like:
- Day 1 - Invite members to submit an order within the next 10 days
- Day 10 - Finalize the orders to see that we have a decent total volume
- Day 11 Call suppliers and agree price and approximate delivery date
- Day 11 Notify members of expected delivery date and the agreed price. If you don't like the price you could drop out here. You would have to act extremely quickly. You will be assumed to want to go ahead, and the supplier will already have your order.
- Day 13 or 14 or 15 (roughly) Delivery