That clearly can vary, depending on where Homehealth are on their stock levels at the time you order. If they have just taken a delivery it could be a longer date.
If you need to buy in bulk, because you're travelling, I have done that when going away for several months and been fine. If you're considering it, to get the maximum advantage from the discount code, then I can point out the saving/discount is exactly the same percentage if you buy 5 or 10 pots (250/500 strips, respectively).
you could always give them a call, or email them from the link on their site and ask them. They are very approachable.
I always order 250 strips ..they arrive in 5 little pots of 25 .. If you order direct from home health the use by is pretty good. Also do remember the discount code