twice a week ne demek more often than not ne demek on a weekly basis ne demek once every three days ne demek infrequently ne demek once in a great while ne demek once in a lifetime ne demek almost without fail ne demek once every few weeks ne demek once every few years ne demek year after year ne demek now and then ne demek only rarely ne demek on alternate days ne demek hardly ever if at all ne demek