This is where it helps to have a diversified cap table. In our case, we have a set of angels -- each with their own expertise.
All of them lead busy lives, but we can get many hours of feedback by picking a subset to talk to on a particular subject. E.g. we have a "former CTO of large SaaS company"-angel who we specifically call with regards to tech stack; an "ex Head of Product" we ask for feedback on product etc.
As an added advantage, it almost automatically leads to strong mentor-mentee relationships on a personal level.
Seems like a phenomenal resource for those who are new to tech mindset/hyper growth/tech culture.
That said, it seems largely not possible for a startup to get more than ~2 hours per partner per week. That's a lot from the perspective of an semi-experienced founder, but perhaps not a lot for someone with minimal experience, seeking more coaching.
For other founders on HN, how much time do you take/get with your investors and advisors? Is their time undersupplied, oversupplied, or just right for you?