Are you a member yet? Membership is open to all and is the first step towards accreditation.
The accreditation process takes an average of 18 weeks from the date you paid. It can be quicker at quiet times and take longer at busy ones, especially if your application includes a KSA portfolio.
It may also take longer if the accreditor contacts you requesting further information. If this happens, you will have a six week window in which to supply it.