That depends very much on how they have been stored. In sealed,dry and cool conditions they can last up to ten years, but this is reduced to two years if these conditions have been different. These times can vary according to variety, and sweet corn seeds do not last as long as the popcorn, dent and similar types.
It depends on what type of corn you want to grow...
It tales about 3-6 weeks to grow into a big corn plant.
Marigolds take about 45 to 50 days to grow from seed to full bloom.
10 years
Spinach typically takes about 40 to 50 days to grow from seed to harvest.
Squash typically takes about 45 to 55 days to grow from seed to harvest.
It takes about 2-3 years for a pineapple plant to grow from seed and produce fruit.
Spinach typically takes about 6 to 8 weeks to grow from seed to harvest.
Squash typically takes about 50 to 60 days to grow from seed to harvest.
Marigolds typically take about 45 to 50 days to grow from seed to flower.
probably a week or two
6 WEEKS