I bought some seeds of coffee to grow a plant in my living-room. I put them between a couple of paper towels and I wet them. Then I covered them with a dish, so that light cannot affect them, and I keep them in my living-room, at about 20°C. After some days, I cannot see any improvement, yet (the seeds absorbed some water, but they haven't germinated, yet).
So, I wander how long should I wait, before giving up and throw them away...
(I checked https://gardening.stackexchange.com/a/8871/7262, but it doesn't say anything about time)