Even though the Prime Day sales are getting longer each year, they will eventually end. It is important to be mindful of time, as the big discounts run out quickly. Otherwise, a great deal may turn into a full-priced luxury item.

To make things even more confusing, there are actually two different closing times for Prime Day sales in the US and the UK. Again, you don't want to miss out on a bargain because Prime Day has already ended, or because you thought it was still going on but it actually ended a few hours ago.

This year's Prime Day will last exactly 48 hours, from midnight on June 21 to 11:59 pm on June 22. That means you still have a few hours (at the time of writing) to mull over your purchase decision.

U.K.: Amazon U.K. Prime Day sale ends at 11:59 BST.

In the U.S.: Amazon Prime Day ends at 11:59 p.m. PDT. 2:59 a.m. PDT on June 23.

If you have accumulated Prime Day free credits, be sure to use them in advance, as many of them also end with Prime Day.

Some sales may be extended for a few hours or days, as in previous years. However, if there is a particularly hot deal, it is not expected to last beyond Prime Day.