The EPO has now released its Annual Review for 2025.
EPO Opposition highlights include that mean duration of Oppositions is 19.1 months, with 51.6% of “standard cases” (i.e. excluding cases with (1) multiple opponents, (2) legal members to take evidence and (3) rescheduling of oral proceedings or multiple oral proceedings taking place) completed within 18 months:

The report also considered Board of Appeal outcomes:

The EPO press release can be viewed here.
The full report can be viewed here.
