Answer: ∞ TLDR: After about 1 year on-the-job experience at a modern company you'll be able to build most products. For ex: I built https://wakatime.com https:

Answer: ∞ TLDR: After about 1 year on-the-job experience at a modern company you'll be able to build most products. For ex: I built https://wakatime.com https://wakatime.com solely by myself (over 6yrs since 2013) after graduating with a C.S. degree and working about 1yr professionally. Long Explanation: I've been programming for 20 years and there's an infinite amount of complexity to programming, application development, hardware embedded systems programming, services architecture, distributed systems, infrastructure automation, data processing & pipelining, machine learning, animation & graphics, protocols & standards, computer science algorithms, etc. No one programmer can build every idea out there.