I don't usually eat out, no more than twice a week.
普段はあまり外食をしなくて、多い時でも週に2回くらい
普段はあまり～しない。not usually ~
多くても、せいぜい at most, no more than,
I don't usually eat out, twice a week at most.
I don't usually eat out, no more than twice a week.
「多くても1週間に2回くらい」は英語で "At most twice a week." と表現します。"At most" は「多くても」や「最大でも」という意味です。"Twice a week" は「週に2回」を指します。
I usually don't eat out much, but at most twice a week.
日本 
アメリカ合衆国 
