How fast do you usually write? Chapter per week?
I'm currently doing the former (feedback per chapter, as I write them), or I will until I'm confident enough (five or so chapters in) then I'll simply finish the whole manuscript before looking for betas
I am pretty slow as it takes a while to get my thoughts onto the keyboard, plus I write on Tuesday Thursday, Friday and Saturday.
But I will probably start getting feedback once I have done a few more chapters.