The 4 floating terminals already exist.
Docking needs to be built for ships. They will be online relatively quickly.
Did you work in the industry? It is going to take 10-12 years and $1,5 trillion to develop enough capacity to receive LNG which costs a lot. It won’t solve the problem of not enough sources though. Nobody wants to invest on top of that because Germany wants to convert from gas to green energy before the investment returns.