If I plant cucumber slices how long will it take them to grow?

Hi, here's instruction on how to harvest the seeds for growth https://www.youtube.com/watch?v=_X9y7Ncqf7k

You can’t take store bought cucumbers and get them to grow. They’ve been sprayed. But if you bought organic possible, and a couple weeks if you put in good solid and water as needed

https://www.gardeningknowhow.com/edible/vegetables/cucumber/cucumber-seed-harvesting.htm

The reason you can't grow veggies from existing seeds is that MOST vegs are GMO vegs. Grow your own vegs from HEIRLOOM seeds, then SAVE those seeds. This is why Europe will not allow MONSANTO to infiltrate their farms.

Most veggies from the supermarket are sprayed with a chemical that retards sprouting.

I buy my seeds from Seed Saver Exchange from Iowa and they grow Heirloom veggies every time.