YOU SAID:

I have been wearing nothing but a robe for two days straight.

INTO JAPANESE

私は2日間、ローブしか着ていません。

BACK INTO ENGLISH

I only wear robes for two days.

INTO JAPANESE

私は2日間だけローブを着ます。

BACK INTO ENGLISH

I wear a robe for only two days.

INTO JAPANESE

私はたった2日間ローブを着ます。

BACK INTO ENGLISH

I wear a robe for only two days.