When the government responds to a request for premium processing, the clock automatically stops.
(213) 394-4554 x0 Mr. Shusterman is a former INS Trial Attorney (1976-82) with over 35 years of immigration experience. His response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.
This is the way that USCIS gets around having to adjudicate your petition within 15 days of receipt so they don't have to refund your processing fee.