What’s the polite amount of time to wait before forking

So you’ve found a library on packagist and it’s great

However as with any code, it has some issues the you discover and you fix them. You do some pull requests like a good little open source community member but they languish, green and unmerged for days, weeks

In the meantime your repository in your composer JSON really slows down any updates

How long do you wait before doing a hard fork?

By that I mean publishing your fork on packagist so that you can more easily maintain it and so releases etc

Also, any way to speed up GitHub repository forks?