It depends if you stretch allot you will become flexible quickly but if you don't it will take longer.
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You can always start dance. Flexibility is not all that you need to take ballet. If you are determined you may become more flexible if you start dancing.
The fastest way to become flexible is by stretching two or three times per day.
I don't think that it is required but i believe many football players do ballet because it is a good way to become more flexible. Being flexible can help out with their football.
take dance classes and practice on your free time :)
It depends how fast you can learn. Some take few months, some take few years.