When do you normally hear from Circuit judges for interviews? Is hiring plan (end of June) still a thing for half of the Circuit judges?
P.S. I applied in mid-April, when should I expect to hear from the Circuit judges?
The hiring plan is definitely not still a thing for half of the Circuit judges, nor has it been for quite some time. Assuming you're a 2L looking for 2017, mid-April is very late to apply for many Circuit Courts. Many have filled for 2017 months ago, and some have filled for 2018.
That said, there are certainly still spots available, but likely not many in desirable circuits or desirable locations.
As far as hearing back goes, you might hear back within days, or you might hear back within months. It's likely that there will be a decent amount of movement in June, as applicants send in updated transcripts with 2L spring grades. But waiting until June to hire is the exception rather than the rule at this point.