Yep, that’s how you do it. Come home for 30 days, file your damn taxes. The feds don’t want anything, but if you ‘live’ in California (and maybe other states) you have to pay the state tax. And property tax etc. There’s nothing illegal or unethical about it, it’s in the tax law as plain as day. Just be out of the US for more than 330 days of the tax year.