Hoe long do you have to have sex to produce a baby?

Not very long!: If you are fertile at the time of intercourse it could take less than a minute (but i hope it would be longer)!

Interesting question: Most specialists quote an average of 6 months trying before pregnancy is achieved.That includes some who get there with the first intercourse, and some that take a year.After a year without success, a fertility evaluation of both partners is considered worthwhile.