Well since this is strange and no ideas I manually added time in seconds to table "bx_videos_entries" ;

It was not big deal since I have to check only a few videos without duration - the duration has a value: 0 in a table bx_videos_entries duration field. After that duration shows on videos.....

If anyone have any idea where to look, what could be the cause for duration not entered in a DB table please respond.

tnx