Shared care with GP

For those of you that managed to get a shared care agreement between Gendercare and the GP, how long did it take you?

Just wanted to know how long I should wait before I bother them about it again since I pretty much got fobbed off the last time I spoke to my GP although it wasn't an outright 'no'. My GP has a history of forgetting things though so I'm pretty worried that I'm just wasting time waiting around.