In a recent publication, Length of Time from Nomination to Confirmation for "Uncontroversial" U.S. Circuit and District Court Nominees: Detailed Analysis, by Barry J. McMillion [Kindle Edition here], we learn:
Average and median waiting times to confirmation increased steadily with each presidency, from Ronald Reagan’s to Barack Obama’s, for uncontroversial circuit court nominees and almost as steadily for uncontroversial district court nominees.
Uncontroversial Circuit Court Nominees
For uncontroversial circuit court nominees, the mean and median number of days from nomination to confirmation ranged from a low of 64.5 and 44.0 days, respectively, during the Reagan presidency to a high of 227.3 and 218.0 days, respectively, during the Obama presidency.
The percentage of uncontroversial circuit court nominees waiting more than 200 days from first nomination to confirmation increased from 5.1% during the Reagan presidency to 63.6% during the Obama presidency.Uncontroversial District Court Nominees
For uncontroversial district court nominees, the mean and median number of days from nomination to confirmation ranged from a low of 69.9 and 41.0 days, respectively, during the Reagan presidency to a high of 204.8 and 208.0 days, respectively, during the Obama presidency.
The percentage of uncontroversial district court nominees waiting more than
200 days from first nomination to confirmation increased from 6.6% during the Reagan presidency to 54.7% during the Obama presidency.
The author defines what "uncontroversial" means. He is an analyst for the federal judiciary. (Yes, Colorado did just get a new federal district judge, but this is over the top.)

