YOU SAID:

In all likelihood, he's got this seat for as long as he wants it.

INTO JAPANESE

おそらく、彼はそれが欲しい限りこの席を持っている。

BACK INTO ENGLISH

Perhaps he has this seat as long as he wants it.

INTO JAPANESE

おそらく、彼はそれが欲しい限りこの席を持っているでしょう。

BACK INTO ENGLISH

Perhaps he will have this seat as long as he wants it.

INTO JAPANESE

おそらく、彼はそれが欲しい限りこの席を持っているでしょう。

BACK INTO ENGLISH

Perhaps he will have this seat as long as he wants it.