Marry in haste; repent at leisure
is a well-known saying.  The Oxford Dictionary of Phrase, Saying and Quotation traces it back to William Congreve in The Old Bachelor.

SHARPER: Thus grief still treads upon the heels of pleasure:
Married in haste, we may repent at leisure.
SETTER: Some by experience find those words mis-placed:
At leisure married, they repent in haste.

Never put off until tomorrow what you can do today.
This is another saying, which people sometimes reverse.

Tomorrow never comes.
When the next day arrives it is called ‘today’.

Tomorrow is another day.
It is never possible to do everything in a single day.  When a day seems to have gone badly it can be a comfort to hope for a new day.  I know this is used in German too.  Morgen ist auch ein Tag.

They go at a snail’s pace.
This is an old expression which has no doubt influenced the modern one about snail mail.  As a pace is a stride and a snail only has one foot, there might have been a humorist at work the first time it was used!

Photo credit Wikipedia

They’ve gone for good.
Good here means ever or all time.

It’s seen better days.
Something is no longer as good as new.

Here’s your hat; where’s your hurry?
This is sometimes said when someone is trying to do something in a rush.  In this context hurry sounds like a means of transport.

Hurry up
is an instruction to do something faster.
Lewis Carroll found some far more interesting words to use in Alice in Wonderland:-

“Will you walk a little faster?” said a whiting to a snail,
“There’s a porpoise close behind us, and he’s treading on my tail.”

The part of a horse’s bridle, which goes in the mouth is called a bit.  Animals champ fodder.  So a person who is impatient to do something is champing at the bit like a horse waiting to set off.

I wasn’t born yesterday.
The speaker has enough experience not to be deceived.

Live to fight another day.
This comes from a proverb, which The Oxford Dictionary of Phrase, Saying and Quotation has listed under ‘Caution’.
He who fights and runs away, may live to fight another day.

Something not worth doing, or inefficiency or unnecessarily checking the same thing more than once could all be considered a waste of time.

At the eleventh hour
has come to mean at the last minute or just in time.

In Matthew Chapter 20 verses 1-16 Jesus told the story or parable of the workers in the vineyard.  The eleventh hour in the story was about an hour before the end of the working day.  You can read the whole story by clicking here.