[Hermitian909]

> I'm investing ~30 hours per company

I just want to say that this is a much higher number than necessary. If you've got skills there's just no reason to ever accept more than 90-120 minutes total before the on-site. That's plenty to receive multiple top-of-market offers (or not top-of-market) even in the current market. Any company pushing trying to make an interview take this long on your side is not worth working at.