As for the time consumed like his company being created in few days. He might not literally created it from scratch. He might have bought a small enterprise or bankrupt company where he only need to provide money to bring it up. As well are technologies he used in this world. The programs he made is just like as simple as copy paste for him. As from where he came from the technologies he used were just elementary level.
Within those 3 times he could redeemed items from the system of higher tier world. Simple materials like money, metal or something that can be used to create a new technology can be provided for him in bulk. As those things are just common garbage item in his real world. I just didn't go in details for it which i'm very sorry.
I just made him create a company, there might be behind the scene situation like buying a small enterprise which already have people. As for materials and time, there's a system that allows him to get anything from the mall. 3 times.
Hi! About your comment. I'm really very sorry about the pits.
About his company in the first world. It's just an extra. As for the details of people, materials and time you are looking for, its details won't be discussed as the arc is something that's for Entertainment industry. Thought I really made the first arc with so much pit holes.