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no problem I can see you are kind of new here, a post with at least 100 words is good for 150 ecency points. So, keep this in mind 😃 for the future.

I try boost but it fails. Many times I did and they returned the amount after 25 or more hours.

yes, I told you the reason now so next time make sure you do follow the steps.
feel free to ask if you have any questions.

Yes I have tried boost lenghty posts as well.

I tried the recent post, which is equivalent to 3 min reading, but still didn't get any boost.

oh that's is bad, forget the past let's start fresh 😅

I just boosted a while ago but I guess it's still not boosted. Can you guess, what would be the reason

try to boost only one post a day. 😁