YOU SAID:

I am not able to chat more than a couple dozen hours.

INTO JAPANESE

数十時間以上チャットできません。

BACK INTO ENGLISH

I can't chat for more than dozens of hours.

INTO JAPANESE

何十時間もチャットできません。

BACK INTO ENGLISH

I can't chat for hours.

INTO JAPANESE

何時間もチャットできません。

BACK INTO ENGLISH

I can't chat for hours.