H1B ADV PP CAL 4/17中签！ 求问PP处理时间

今年第一次抽，昨天收到律所邮件说中签！！
想问一下PP的15天处理时间是从什么时候开始算。看到地里很多同学说是5月20号。但是阅读receipt上的意思好像是从收到的时间开始。
receipt如下
The California Service Center has received the following I-129 Petition for Nonimmigrant Worker that had been filed under the Premium Processing Program:    H1B

Receipt Number: WAC191***********
Date Received: 04/11/2019
Petitioner: *************

Beneficiary: *******
DOB: ************
Classification sought: H1B

The Form I-797 Receipt Notice will follow in the mail.

The California Service Center will adjudicate this case within 15 calendar days of the "received date" set forth above. If approved, you will receive e-mail notification of such. If we require additional evidence, we will fax said request to the fax number provided on your completed I-907 Request for Premium Processing Form.

如果是4/11received，意思是26号之前会有结果？？

IG网站上说了这个，是从5/20开始算

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