One Day Seems Like 1000 Years in Chinese / Japanese...

一日千秋 is a Japanese and Chinese proverb about missing someone.

一日千秋 is often used to express how hard it is to wait for someone's return or to be away from someone.

Some will translate this as “one day feels like a very long time” or “waiting for someone (something) is hard.”

You might see this romanized as a single word, Ichijitsusenshuu, or as “Ichijitsu Senshuu” from Japanese.
If you break down the characters one-by-one, we get:
一 = one/a
日 = day/sun (can also represent time or date)
千 = 1000/thousand
秋 = autumn/fall

Together, 千秋 can mean “autumn comes thousand times” (or 1000 years). It can also be read as 1000 periods of time.
However, it relays the idea of heartache as you wait for someone you miss.

Nothing could be more true. When I was in the Marine Corps, we trained for years for combat that often lasts only hours.

養兵千日用兵一時 is a Chinese proverb that, also reminds me of a common phrase used in the military to describe combat: “Weeks of total boredom, punctuated with five minutes of sheer terror.”

This may have some roots in Sun Tzu's The Art of War. Though I can not find this passage in his writings.

On the subject of the Art of War, if you have a favorite passage, we can create a custom calligraphy scroll with that phrase.

讀萬卷書行萬里路 is a lifelong suggestion for expanding your horizons by gaining knowledge, experience, and seeing the world.

Of course, this was written long ago when it was hard to travel 10,000 miles (at least 1000 years before the invention of the airplane).
With air travel and the business I'm in, I often achieve that lifetime goal on a monthly basis.
However, I am a little behind in the book count.

Note: An ancient Chinese mile (里 or lǐ) referred to in this proverb is about a third of a British/American mile. However, at that time, this was a great distance to travel.