Adjustment of Status - I-485

hi guys i just wanted to let you know i finally got an update on my case!!!got an email today saying ive been scheduled for an interview so to wait for the letter in the mail...Thank GOD!!!i had almost given up hope on receiving anything this month ,l had my fingerprints taken on Feb 16th and since then nothing had changed till today morning.i know it might not be much but its something and it consoles me.this waiting with no change took a toll on me but thank God for each and everyone of you.just reading all your experinces.seeing some of you get goodnews and cases progressing made me so happy for everyone.for those who are still waiting.please dont give up hope,use the info pass as often as you can,i nagged them so much last week and maybe that helped and i learnt about all that by just reading things here.good luck and praying for good news for all of us,question,how long does it take to receive the letter in the mail after you get an email notification?