Can my WHV get rejected if I would go for only a few months, not the whole year?

I'm planning to go for a Working Holiday for 3 months. I have come across an advice that you should state that you go for 9 months at least for them to approve the visa, but I didn't see anyone else say anything talking about it, which is why I would like to know about your experiences/opinions.

I heard that you noone checks your schedule after you submit it, but still, there is can be an interview on the embassy etc or other complications, so I would prefer not to lie too much if it's not necessary. Although for now I'm planning to make up a schedule for a whole year and then have an unexpected change in the plans if anyone asks.

I know that some of you will say that it's a once in a lifetime opportunity and that I shouldn't waste it on only 3 months, but I have my reasons, so please just answer my question. 😀

(for reference, they include: a) I'm in a situation where it's pretty possible that if I don't go now, I will not get to use WH opportunity again, b) I'm from a country that allows getting the WHV twice in a lifetime anyway, c) not many people from my country tend to use WHV, the number is pretty far from the limit so I wouldn't be taking the opportunity from someone who plans to stay for a whole year)

I also don't want to visa free, if anyone would be against it I can just explain it in the comments to not make this post longer.

by aul_owl