Can Fresh H1B premium processing upgrade after RFE take long than 15 business days

[mexico]

My Fresh H1 2016 was filed under regular processing. I got selected in lottery.

I got RFE on September 10, 2015.
My employer says he filed response to RFE/I-129S under premium processing. Today's status is below,

On November 20, 2015, we received your response to...

[Vyas Mohan]

Hi Friends

I filed H1 extension in [premium mode] on Jan 15th 2015. Got an RFE (Employer - Employee relation) on Jan 29th.

Attorneys are filing the response by this week. (Assume Feb 20). How long would it take to get a response? Since I'm in premium mode, would it take...