About / exactly
Hedging an amount or pinning it down exactly.
gurai
about; around
ぐらい
Goes after a number or word to mean 'about' (gofun gurai) or 'to that extent' (sore gurai, onaji gurai).
ichijikan gurai kakaru yo
It takes about an hour.
1時間ぐらいかかるよ
ichijikan gurai kakarimasu yo
It takes about an hour.
1時間ぐらいかかりますよ
kurai and gurai are interchangeable. 'Onaji gurai' means 'about the same'. sore gurai also means 'that much at least': sore gurai wakaru yo = I know that much.
daitai
roughly; mostly
大体 だいたい
Goes before a number or claim to mean 'roughly / mostly' (daitai wakatta). It hedges any amount or statement.
daitai ichijikan gurai kakaru yo
It takes roughly an hour.
大体1時間ぐらいかかるよ
daitai ichijikan gurai kakarimasu yo
It takes roughly an hour.
大体1時間ぐらいかかりますよ
Opening a complaint, it means 'in the first place' (daitai, nande…).
choudo
exactly; just right
ちょうど
Means 'exactly / just right' for amounts, sizes and timing (choudo ii, choudo ima).
choudo ichijikan kakatta
It took exactly an hour.
ちょうど1時間かかった
choudo ichijikan kakarimashita
It took exactly an hour.
ちょうど1時間かかりました
'Choudo ii' (just right) and 'choudo yokatta' (perfect timing) are the most common chunks.