PayPal API Reccuring payments

Question

I need add recurring payments to my site. Before registration user must pay for example 10 GBP for 1 month and thereafter 9 GBP every month. I try to create recurring payment according to [PayPal][1]. But in IPN i am not recieved responce subscr_signup or other. When i completed doExpressChechoutPayment i recieved status Pending. How much time i must wait for authorization is complete? i use sandbox.