Yes, the answers will vary greatly. For my first, offer was in January 2019, signed contract in March, announcement in November. For my second, offer in July 2020, contract signed in August, announcement a few weeks later. The big difference between them was for the 2nd, they had an illustrator on board when the offer was made to me. For the first, they didn't find an illustrator until October of that year.
I had an agent negotiating for both.
Oh, the one offered in January 2019 comes out in May 2021, the one offered in July of 2020 will come out Fall 2021. Again, big difference between both houses. (And the fact the illustrator was on board immediately for the 2nd.)