How do you count 15 days PP ?

GC_Europe

Registered Users (C)
My lawyer applied for H1b transfer and extension at the same time with premium processing.....he sent us an email saying that the H1b has been filed on May 3th.....now my question is.....how do you count 15 days?.....it means 15 business days......so the reply from Uscis would be on May...the date?...
Thanks
 
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