I have documented evidence that it actually took 16 days to sprout my 1 little test plant of Clockwork Black X Blue Dream. The official estimate is wait up to 2 weeks. If I were you I would give them 3 due to my experience.
I always wait but if it doesn't sprout after a week I start to lose hope. If you gently squeeze the seed and it's still hard it may still germ but if it just squishes in your hand its a dud. I've had seeds that wouldn't germ until I squeezed them until the shell cracked very slightly and they sprouted within a day
Keep in mind, if it took two weeks to pop, it is NOT a strong seed. The plant will usually grow slow and pathetic (in my experience). I usually just toss the seed if it takes more than a week. After that, even if it pops, it still isn't worth my time to have a slow, small plant in the GR and will just get tossed. You don't want a midget in the room. We strive for an even canopy and that plant will always be stunted and below the rest of them.