YOU SAID:

I don't know, when is he getting here? His stupid headache takes too long to end.

INTO JAPANESE

彼はいつここに来るのか分かりません彼の愚かな頭痛は終わらせるのに時間がかかりすぎる。

BACK INTO ENGLISH

I don't know when he will come here His stupid headache takes too long to end.

INTO JAPANESE

彼がいつここに来るのかわからない彼の愚かな頭痛は終わらせるのに時間がかかりすぎる。

BACK INTO ENGLISH

Not knowing when he will come here His stupid headache takes too long to end.

INTO JAPANESE

彼がいつここに来るかわからない彼の愚かな頭痛は終わらせるのに時間がかかりすぎる。

BACK INTO ENGLISH

Not knowing when he will come here His stupid headache takes too long to end.