I hadn't got any answer when I posted the question the second time. Anyway, I'm not used to forums and I don't know how many times I can post things and the proportion between posting and getting answers. Next time I will behave better. Thanks a lot!
Usually there are answers fairly quickly, but sometimes you may need to wait a few days. We're all just users helping other users on our own time, so depending on how busy people are and whether someone who knows the answer sees the question, the time it takes to get an answer is unpredictable.
As for posting, pick what seems to be the best section and post there and not in another section. Posting in more than one section can be confusing and makes it harder to get good followup. There is no "proportion between posting and getting answers." Posting in more than one section does NOT mean you'll get more or faster answers.
If you've posted a question and several days (a week or more) go by without an answer, you could post again, mentioning that you already asked this question and didn't get an answer. Or try a different section, but again, post only in one section.