The one minute

BARKEEPER

Will you go looking for her?

THOMAS

She is in the past.

…The past is not my concern.

And the future is no longer my concern either.

BARKEEPER

What is your concern, Tommy?

THOMAS

The one minute.

The soldiers minute.

In a battle that’s all you get.

One minute of everything at once.

And anything before is nothing.

Everything after, nothing.

Nothing in comparison in that one minute.

Peaky Blinders, season 1 episode 7 (wiki)