To make this possible, you will employ a few important methods. How long it takes depends on you, but if you follow the steps laid out below, you'll come out the other side with the ability to read hiragana. Some people have reported back that they could read all the hiragana after a few hours, using this method. You should be able to learn everything in a couple days. Many classes and individuals spend months learning hiragana. In essence, it's the first step to learn Japanese. There are no (good) Japanese textbooks or learning resources that don't require you to know hiragana.
It will also open doors in terms of the Japanese resources you can use. By learning hiragana, you will learn the basics of Japanese pronunciation. To learn hiragana is to create a foundation for the rest of your Japanese.