Lol how long is a piece of string would be a safe bet for an answer
It does depend on if you have group starts for pump users when your hospital/commissioning group pays the bills, As
@noblehead says could take 3 months. Looking on the bright side you are almost there, you know you have the funding and are going to choose your pump
Some people can take up to 6 months to set there basal profile so be prepared for a long haul. Have you bought Pumping insulin yet by John Walsh? This will give you a head start and a better understanding of things to come