With the various things that must be done, I have only an hour and a half that I can use for my self-improvement.
With all that I have to do, I can only allocate an hour and a half for my self-improvement.
ご質問ありがとうございます。
①
"With the various things that must be done"＝「いろいろとしなければいけないことによって」
"I have only an hour and a half"＝「一時間半しかない」
"that I can use for my self-improvement."＝「私が自己研鑽に使えるのは。」
②
"With all that I have to do"＝「私がしなければいけないことによって」
"I can only allocate an hour and a half"＝「一時間半しか割り当てられない」
"for my self-improvement."＝「自己研鑽のために。」
ご参考に！
アメリカ合衆国 
