see prev message - pack ... yes by legislation.
set SCOTUS terms ... nope- fixed at LIFE in the US CONSTITUTION.
terms of district and circuit feds can be set by legislation ... but absolutely NOT for SCOTUS.

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...