> How long would the development cycle take, if everything is to be written in C?

Once upon a time I worked on a website backed by C. Development times were not appreciably longer.

We had a in-house templating language for generating HTML (also written in C). That implementation got to the complexity point to where even the original devs did not want to touch it to add anything.

But in terms of add a new screen collecting fields x,y,z it was fine. This was a job board, allowing search, applications, saved resumes, bulk opening uploads, i.e. there was some real functionality there.