How many answer choices is too many answer choices? When building a survey, what is the maximum number of response choices in a question? In the interest of reducing cognitive load and/or avoid choice paralysis.
I couldn't find any research on this specifically.
Take a look at researches on human Working Memory Capacity (WMC) and it applications in different problems, for instance, here is Elsevier ScienceDirect chapter/paper set related to WMC. Most of the researches depicts that WMC of an adult human is limited to 3-5-7 items, depending of how large and complex these items are.
Therefore, if your survey question is about something minimalistic, like preferable color or time slots, which are quite simple objects to comprehend, you may confidently provide up to 7 answer options. But if your question is asking about behaviour in some imagined environment, and answer options present different complex scenarios in a response to this environment, it's better to limit them to 3-4 options so that respondents would be able to comprehend each option separately and consciously compare it with other ones.