It takes about 120 days until a watermelon is ready to harvest. Depending on where you are located, though, this may take a different amount of time.
The smaller varieties may have a higher maturity rate, with some going from seedling to fruit-bearing in only 90 days.
A watermelon typically takes about 80-90 days to grow after flowering.
~4 months
1 year
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