At the longest

Pro Tip 1/3

Maximum Duration

Use it to specify the maximum amount of time expected for an event or action to conclude.

Your order will arrive in three days, at the longest.

Pro Tip 2/3

Expectation Setting

It sets expectations, indicating that something could be completed sooner, but definitely not later.

I'll read the report by this afternoon, at the longest.

Pro Tip 3/3

Emphasizing Speed

Often used to emphasize quickness or efficiency, suggesting a task won't take much time.

The meeting will last 30 minutes, at the longest.