What is a reasonable time to get to your pre baby weight?

I'm kinda the first of my friends to have a baby so I don't really know what to compare it to. I looked up some celebreties and they all do it in weeks and my husband says that's not realistic.

It's been three months for me. I work out three times a day and eat a low carb diet but I'm still not there.
What is a reasonable time to get to your pre baby weight?
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