Hi johanssonskan and welcome to the RH community. I'm afraid
you are unlikely to get a firm answer to the timescale question as
there are so many variables that could affect the answer. Speed of
connnection, traffic, number of topics, complexity of the project,
whether you republish all files, baggage files, image sizes and
formats, hyperlinks, etc. etc. can all have an affect on the
publish speed. Most users have no problems publishing to a server.
BTW you can publish to a server with good old ordinary RH. The
Server product is not required for this.