私は今働いているから、勉強できても一日に精々一時間ぐらいしか勉強ができない。
Since I am working now, even if I could study, I can only study 1 hour a day at most.
「電車が来ないうちに観光出来るのは精々４時間ぐらい。」
'Before the train comes, we can do sightseeing for four hours at most.'
「３８歳だって？精々３０くらいなものだと思っていたよ。」
'38 years old you say? I thought he was around 30 at most!'
私が作れる料理はせいぜいこんなもんです。
This is at best what I can cook.
加害者はたぶん精々３０歳ぐらいでしょ。
The assailant is about 30 years old at most.
ダーデンは精々二流のコーチだぞ！子供でさえもっと上手くコーチングできるぞ!
Durden is a second-rate coach at best! Even a child can coach better than him!
「この車を買うのに彼が支払ったのは精々３万ドルだと思う。」
'I think that in order to buy that car he spent 30 grand at most.'
「この選手の動きからすると、精々２、３年空手を習った程度だろう。」
'Judging from this athlete's movements, he has been studying karate for 2-3 years at most.'
「手伝いたいけど、救急要員が少ないので精々５人しか送ってあげられません。」
'I want to help, but because there are few first-aid personnel available, I can only send you five people at most.'
このプロジェクトに出来るだけ多くの時間を割きたいが、一日に使える時間は精々三時間とかだろう。
I want to dedicate as much time as possible to this project, but in a day I probably only have 3 hours of useable time at most.
昔の日本人が高い白米を食べられたのは、精々祭りや結婚といったイベントの時だけでした。
The Japanese of old used to only eat good quality white rice during events like weddings and festivals at most.
「これ、１０００円です。」「１０００円だって？この服の品質がそんなに高いとは思えないがね。払えるのは精々５００円でしょ。」
'This is 1000 yen.' '1000 yen? I don't think that the quality of these clothes is that high. I can pay 500 yen at most.'
平和な田舎ではほとんど鍵なんか使わなくて、使うとしても精々治安が悪化している時くらいだ。
Locks are mostly not used in the peaceful countryside, and even if we assume that they were, it would at most only be in times where the safety worsens.
今日現在、テスラＳという電気自動車では一充電あたり精々数百キロ走行分くらいしか蓄えられない電池を載せることしかできないけれども、おそらく近い将来グラフェンという物質によって電池の満充電容量は劇的に増えるのではないだろうか。
As of today, an electric car called the Tesla S can only carry batteries that store enough energy for a maximum of a few hundred kilometers per charge, but, I think that in the near future, the capacity of batteries will dramatically increase because of the substance known as graphene.