On my day(s) off, I've usually got so many chores to do that the day is soon over.
On my day(s) off, by the time I've completed all the things I have to do, the day is over.
I spend my day(s) off completing chores and going to appointments so there's no time to do anything exciting!
「休日は、いろいろ用事を足すだけで、一日が終わります。」＝
On my day(s) off, I've usually got so many chores to do that the day is soon over.
On my day(s) off, by the time I've completed all the things I have to do, the day is over.
I spend my day(s) off completing chores and going to appointments so there's no time to do anything exciting!
ボキャブラリー
day off ＝ 休日
usually ＝ 普段、いつも
chore ＝ 用事、家事
day is soon over ＝ 一日がすぐ終わる
completed ＝ 完成した
things I have to do ＝ 用事、やるべきこと
spend ＝ 過ごす
appointment ＝ 予約
no time to do anything exciting ＝ 面白い事をする時間がない
I often have to run lots of errands on my day off, and then my day is over before I know it.
この場合、次のような言い方ができますよ。
ーI often have to run lots of errands on my day off, and then my day is over before I know it.
「休みの日はいろいろ用事を足して1日が終わってしまう」
to run errands「用達しをする」
before I know it「あっという間に」
ご参考まで！
イギリス 
カナダ 
