How Long Does It Take Seeds To Sprout Outside. If all goes well, the seeds should take 24 hours to start sprouting, but if they haven’t (this might happen with old seeds), leave them for up to 72 hours and check on them constantly so they don’t run out of moisture. Sprout seeds just until they’ve germinated to avoid snapping off longer sprouts.
Also take about 2 weeks to sprout. Luckily most vegetable seeds are soft and don't need scarifying. After soaking the seeds as described above, drain off the water and put seeds on a piece of window screen or in a small sieve.
You want the grass seeds to be in direct contact with the soil, so rake the seeds gently after sowing.
Super hots can take longer to sprout, sometimes up to 6 weeks. Basically, seeds need a sterile medium, water, air and warmth. This process mixes the dirt with the seeds. An alternative for keeping them wet is to wrap them lightly in wet paper towels.