（数量 etc） + は

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The 「(amount)は」 pattern can be used to express "at least (amount".

E.g. このスーツケース、20キロはあると思おもう。 "I think this suitcase is at least 20 kg."

E.g. 沖縄おきなわすごく良いいから、1回かいは行いったほうがいいよ！ "Okinawa's really great, so you should go at least once!"

E.g. 難むずかしかったけど、85点てんはあると思おもう。 "It was difficult, but I think I got at least 85 points."

Non-amount words can be used in combination with は as well, to express "at least X":

E.g. 時間じかんがなくても薬くすりは飲のんだほうがいいですよ。 "Even if you don't have time, you should at least take your medicine."

ぐらい・くらい can also be used to form the 「(amount/non-amount)ぐらい・くらいは」 pattern.

E.g. 一口ひとくちくらいは食たべたら？ "Why don't you at least eat a mouthful?"

E.g. あと5分ふんくらいは待まとう。 "Let's at least wait another five minutes or so."

Summary

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  The 「(amount)は」 pattern is used to express "at least (amount"

• 

  Non-amount words can be used in combination with は as well, to express "at least X"

• 

  ぐらい・くらい can also be used to form the 「(amount/non-amount)ぐらい・くらいは」 pattern