Just to add some anecdata, this was my HL-15 order timeline:
- I ordered the fully-built option on 2024-05-03, got an automated order confirmation email on the same day.
- FedEx gave me the tracking number and said “We have your package” on 2024-05-13 (so, ~10 days to build and test)
- Delivered and unboxed 2024-05-17.
All told, my wait was two weeks.
Shipping depends upon where you are. 45Drives is in Canada, and I’m in the US, so everything was pretty quick, IMO.
I’d suppose the production/validation phase might take less time for you, since you are not getting the Fully-Built system (although I believe they do still take some time to test the backplane and such).
Shameless plug: I wrote a post here about Unboxing the HL-15 (Fully Built) if you’d like some reading material while you wait. 
If you have any other questions, feel free. Hope the HL-15 serves you well!