How to annotate huge dataset for object detection?

I have like a hundred thousand images to annotate for object detection. Though each image will have only one object, but it will still take forever if done manually. Can someone please suggest me some way to automate this process or to reduce manual work? I know these kind of techniques exist but don’t know where to learn them from.

There is a ton of tools to do this.
The ones that are automatic are mostly payed.
LabelBox, LabelStudio, AnnotateMe, Spacy, etc…

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