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Not time travel, but a standalone book that I really enjoyed (and have been mulling over a third read of) is Kiln People by David Brin. It explores a future where people can make cheap clay duplicates of themselves that last about a day. They send these golems out to do whatever errands they have and when the golem comes home, they upload the memories to their own minds.
It's a fun read that uses a detective as the main character and it avoids the too common dystopian, dark future tropes.
Kiln People is sometimes identified as the first in a series, but I don't know where that comes from. There is no sequel and I don't think one was ever announced.
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