as much as を使った文章とのことですので、次の例文のように言うのはどうでしょう?
ーI spend as much time studying as I do sleeping.
「眠っているのと同じくらいの時間を勉強に費やす。」
as much time studying as I do sleeping
ーI spend as much time in the books as I do in my bed.
「ベッドにいるのと同じくらいの時間を本に費やす。」
as much time in the books as I do in my bed
どちらも spend as much time ~ing as ~ 「〜と同じだけの時間を〜するのに費やす」という言い方です。
ご参考まで!