Date of switch

I am taking out my first policy with any supplier for gas and electric. I used comparethemarket.com but I think it said it will take 17 days to process. Is this true? As the house is currently supplied by EDF and that will end on the 27th of this month.

@DylanW98

Once we have received the switch request from comparethemarket.com, which can take a few days, switching takes 21 days, not 17.