ANIME ORIGINAL CONTENT IN K-ON! Season 1 (13 Episodes + 1 OVA) -WITH OP/ED- 05:31:20 - total time 04:13:43 - original material 01:17:37 - adapted material -WITHOUT OP/ED- 04:42:20 - total 03:24:43 - og 01:17:37 - adapted Percentage of original material with OP/ED: 76.6% Percentage of origina...