You should not record more than 15-20 minutes at a time. The reason for this is that our voices sound different after continual use so recording for too long can potentially mess with the data and confuse our training model.
Anytime. People sound different depending on what time of day it is so it's actually better to record yourself at different times of day instead of at the same time everyday. This will give our model more variation so it won't be influenced too heavily by recordings that were taken at a specific time of day.
One of the cool things about the Makah language is that people say things differently depending on what their gender is so this information is important for trainging our model. This is the only reason we ask for your gender when you submit recordings and if you have any more questions or concerns, feel free to reach out to us on the Contact Us page.