N4
だいたい
Most・mostly, Adequately・generally, For the most part, Roughly・approximately, In the first place
だいたいでいいから何時くらいに着くか教えて。
Since a general time is okay, can you let me know around when you will arrive?
Explanation
「だいたい」 has 3 uses
1Mostly
Most of something is understood, done or true: 「日本語がだいたいわかる」 I understand most Japanese, 「だいたいの人」 most people.
「日本語が大体わかる。」
'I understand Japanese for the most part.'
だいたいの人たちが薔薇という漢字を書けません。
Most people can't write 薔薇, the kanji for 'rose'.
2About, roughly
With a number or time, gives a rough figure: 「だいたい30分」 about thirty minutes.
だいたいでいいから何時くらいに着くか教えて。
Since a general time is okay, can you let me know around when you will arrive?
水曜日はだいたい5時に起きています。
On Wednesdays, I generally wake up at 5 o'clock.
3In the first place
At the start of a complaint, 「だいたい」 means "in the first place": 「だいたい、なんでここにいるの?」
だいたいなんでお前がここにいるの?
Why are you even here in the first place?
「大体、太郎が一人でそこへ行ったことが間違いなんです。」
'In the first place, it was a mistake for Tarou to go there by himself.'