Apple did not specify what's wrong with my app and how many days should I wait

Problem may not be with the app itself but with the account verification. Which may take much more time.

In fact, they do not require a new binary.

Did you notice or do anything special on your account ? Or there is some missing information on your account.

They rejected and reviewed it twice ( I did not submit anything). This is what I got after the status was changed several times:

Hello,

Thank you for your continued patience.

We are writing to let you know that we have completed our evaluation of your app and account. Upon further review, we found that your app does not comply with the following guidelines:

Guideline 4.3 - Design - Spam

Your app has similar features to others. As such, it duplicates the content and functionality of many other similar apps currently available on the App Store.

While these app features may be useful, informative or entertaining, we simply have enough of these types of apps on the App Store, and they are considered a form of spam.

Next Steps

We encourage you to review your app concept and incorporate different content and features that are in compliance with the App Store Review Guidelines.

You can avoid delays to future submissions by ensuring your apps don’t attempt to mislead or harm customers or undermine the review process. Review the App Store Review Guidelines and read the Developer Code of Conduct so you understand our requirements prior to submitting any apps for review.

We hope you will consider making the necessary changes to be in compliance with the App Store Review Guidelines and will resubmit your revised binary.

Best regards,

App Store Review

Hello,

Is this the first submission of this app or an update? Additionally, is this your first app on your account or you already have other apps? What is your app about?