6 months is normally completely unacceptable, but when there are serious computer problems that is not at all the dev's fault. I'm hoping soon for either here or WTAGTH. Or both.
Why should it be completely unacceptable to need more than 6 months for an update? We often have to wait years for sequels to movies, books or games and yet we usually come to terms with it.
If someone supports the developer, but cannot cope with these waiting times, then he is free to withdraw his support again. Ridiculously, the loudest people are usually those who have probably never donated a single cent to a developer in their life
I think some people don't understand the concept behind Patreon and think that their financial support gives them automatically the right to regular "fast" update-intervals. Because of the financial support of the
donors (incidentally, that is what they really are), the developer does not become an employee who has to do work on time for the "payment".
In some cases developers can actually live very well on these donations and then concentrate more on their projects instead of regular work, but that's not always the case. In addition, there is the factor of real life including family, which all the complainers like to ignore.