Legally? Zero days. You have been out of status since December 17th and accruing unlawful presence since April 10th. Once you accumulate at least 180 days, you will trigger a bar from the US upon leaving. Additionally, the length of your overstay will be a factor in future visa applications.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.