Realistically how much more time would it take to learn Java as a 1st language instead of c++/Ruby if I only intend to self-learn/take classes?

[Hector]

Hi everyone, I have a question for community members, realistically how much more time would it take to learn java as a 1st language instead of c++/ruby if i only intend to self-learn/take classes? Please inform me and do not ignore my subject.