I know seedlings like a higher temp around 78 degrees if I'm not mistaken. If you could get a heating Mat at your local nursery that might help out.
Also if you purchased your seeds from ILGM they garuntee gremination so if they don't sprout in a wee or so you could contact customer support and see if they will reship your order.
I would imagine you would see some of them poke through within 17 days.
How far down did you plant them?
I germinate my seeds in a paper towel and transplant them into soil once the tap root has broken through. I've never germinated using the soaking method so I'm not sure how long they typically take to pop out. Mine are usually poped up after a few days but like I said my tap root is out of the seed already before planting.