From what I can tell from a quick google search, producing one laptop is about 5-10,000MJ, about 70% of the energy used over its lifetime, pretty much just as you said.
This is about a month or two worth of household electricity usage.
It is equivalent to driving somewhere between 1,000-5,000 miles in a car depending on whether it’s gasoline or EV.
I think my guess was somewhat close. The average American is driving roughly 14,000 miles per year per person according to the federal highway administration. Most are doing so in a gasoline car, so we might surmise that buying a laptop is equivalent to about a month or two of an average person’s driving habits.
In my opinion that is one of those numbers that is both a lot and also not a lot at the same time.