YOU SAID:

I really like spending time with you but I don't know how long this will work out

INTO JAPANESE

私はあなたと時間を過ごすことが本当に好きですが、これがどれくらいうまくいくかわかりません

BACK INTO ENGLISH

I really like spending time with you but I don't know how well this works

INTO JAPANESE

私はあなたと時間を過ごすことが本当に好きですが、これがどれほどうまくいくかわかりません

BACK INTO ENGLISH

I really like spending time with you but I don't know how well this works