Approximately 750 seeds of viable Diva cucumber seeds from a 5 gallon (about 19 liter) bucket that was full of old fruit. Many of the old fruit would have only a few seeds and some had none at all. Just for reference, these were grown outside in the presence of bees.
Wondering why parthenocarpic seed is sometimes expensive? Getting good pollination with fruit that sets even without pollination can be a challenge.