In our experience, it takes about 2-4 months on average to launch a startup product, but the actual time frame can be quite different, both up and down. It all depends on the complexity and scale of the product. That’s why it is important to run a discovery phase (forming a product vision, creating the roadmap & backlog, selecting the technology stack, and drafting solution architecture) to get the full understanding of the solution-to-be. Based on this understanding your supplier will be able to estimate the efforts and plan the timeline. The development timeline depends on the product scope a lot, so it is important to find the right balance between quality expectations, functional requirements, and target time-to-market.