Are you asking how long it takes to prepare custom lenses or to actually receive the glasses?
In either case I’ve ordered a couple of pairs from them—I’m a big fan. Let me see if I can find the order emails.
Here’s how long it took from order to ship to arrival based on old emails from Warby Parker.
Ordered 8/21/2018
Shipped 8/23/2018 - 2 Days to Ship
Received 9/7/2018 - 16 Days to Arrive
Ordered 8/20/2013
Shipped 8/24/2013 - 3 Days to Ship
Received 9/4/2013 - 13 Days to Arrive
Basically, it only takes a couple days to ship and up to 2 weeks to arrive.