One thing I would point out is that batch 1 is a single design single board per unit only and was limited to 500 units. So the difference between first and last isn't quite the same as being the difference between the first and last BFL order.
I have no idea if HF can meet their deadline. No company to date has. The closest would probably by Bitfury (US distributor) with only a 3-4 day delay for all batch 1 orders and the worst is BFL with a 6-9 month delay. That being said assuming they have competent production and can move out 100 to 150 units a day (pretty conservative) the timeframe from first unit to last unit would be 3 to 5 days.
What concrete fact are you looking for. I have found if you ask a specific direct question the HF staff will generally respond (although it can take a couple days). Vague questions like give us your entire supply chain are likely not going to get answered.