I have done invocation with Lucifer but it’s seem to be very easy to me cos it doesn’t take time for the sigil to start disappear and appear but I believe that Lucifer is always around me and he can hear me very well and I hope my prayers are being answered .I need to call Azazel because I need knowledge and wisdom for my business and my daily life but I don’t know how long should I wait before I start invocating him after finishing with Lucifer . please share some knowledge guy’s.
Thanks 
There’s no such thing. Anytime you feel like it’s the right time should be when you invoke Lord Azazel.
If you still not feel safe to do that, seek guidance with Lucifer.
I would just call him. Any time spent between interactions is for us, not them. It’s not uncommon to speak with several at once, either.