What's the sweet spot for traction for a pre-seed company?

Ideally you'd would walk into a VC firm with amazing traction numbers and they'd be so excited, you'd only have to pitch 1-2 VCs before closing your round. I mean , I want to spend time building my product not pitching to VCs. The question I have is what's the sweet spot? If I don't have decent traction and try to raise I'll spend all my time in meetings. If I want too long then I'm hindering my growth as I don't have enough money to grow my company. I'm not an Internet celebrity, didn't graduate from Stanford or anything so I don't have any 'suspend belief' magic behind me. I also want to only raise based on *ME* and without a co-founder. I did a co-founder last time and didn't enjoy it. I want to be a solo co-founder and instead bring in an amazing team later. I'm not ruling out a co-founder it's just so difficult to find one. So basically, how much revenue, customers, etc do I need as proof of traction to VCs?