It takes a while to get married.
The thing that normally takes the longest is getting 60 Harvest Sprites, which is one of the marriage requirements.
If you know what you're doing you could get married in less than two years.
Unless you're trying to marry a Mineral Town character. Then it takes at least three years to marry Kai and usually four years to marry any of the other Mineral Town guys.
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The pregnancy lasts for 60 days
21 days.
Around 60 days but if you forget your husbend will tell you the day before you have the baby
That depends on which Harvest Moon game you are playing. Most of the Harvest Moon games go on for as long as you play it though.
IN Tree of tranquility, you'll get a cutscene 2-4 seasons after getting married. One month after this, you'll have a baby.