Harley Quinn's journey, in order
To watch the Harley Quinn movies in order, start with Suicide Squad, then Birds of Prey and The Suicide Squad. That's 3 out so far, about 6 hours, ending with The Suicide Squad.
Margot Robbie played Harley Quinn in three films, each a little further away from the Joker.
Updated
The Harley Quinn movies in order

Suicide Squad
Harley joins Task Force X, with the Joker never far away.

Birds of Prey
Harley and the Joker have split up, and all of Gotham knows it.

The Suicide Squad
Back on the Squad, on a mission to Corto Maltese.
Questions
What order should I watch the Harley Quinn movies in?
Start with Suicide Squad, then Birds of Prey and The Suicide Squad, and follow the list above: 3 in all, ending with The Suicide Squad.
How long does it take to watch all of the Harley Quinn movies?
About 6 hours for the 3 out so far.
Do I need to watch Suicide Squad (2016) before The Suicide Squad?
No. The Suicide Squad brings back a few characters but tells its own story.
Watch the Harley Quinn movies with Chronologica
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