What is the average time to get a new blog to 1000 UV a day?

That's such a random question with infinite variables.

The fact is, even with exact informations such as niche, competition, budget, PBNS etc. nobody could actually give you an honest answer.

It seems like to me you're in a rush. SEO doesn't work that way at all. you'll probably have to wait 30 day anyway.

the main difference will probably come from your own experience. If you've never built a PBN, or if you never worked on on-site SEO etc, it will probably take you month to get an idea of what you're exactly doing.

PS: there is no "relatively good content", either your content is top notch quality and it helps, or its not, and you will never get on top.