How long is the wait after "Unable to make a decision"?

Standard Fiance Visa, Outside

Bio: 27 February

This is stressful as hell. Our solicitor, timely as ever, just informed us that on May 22 (57WD) we received the dreaded "Unable to make a decision within published processing times" email. Today is our 60WD. Our solicitor maintains that it shouldn't take much longer but I don't know who I've lost faith in more - him, or the Home Office.

For those who received a decision after the delay email, roughly how long did you have to wait?