Inconsistently.
Jane's network has kept all the Bells' worlds - and every other world with a Janepoint stuck in due to its being attached to Downside - in temporal sync, but when Jane spluttered for just a moment, that was shot to hell.
Peace lost three seconds, because it was where Aegis torched; after that process was complete, Jane was there again. And as soon as a door between Peace and Milliways appeared, she could sync to her ansible hub in the Belltower and, from there, to everywhere else.
Atlantis and Sunshine each stand at about a minute apiece: Shell Bell's aura and Juliet's local copy of Jarvis both enabled them to get to Milliways immediately, pausing their homeworlds as standard for occasions when someone walks into the bar. Shell Bell's the one who connected Peace.
Everyone else was running on luck.
Luckiest is Rainbow, which lost only five hours.
Next is Alethia; in spite of Sherlock's mishap, it's fared reasonably well, spending only six weeks isolated.
Syntropy's just a little worse - seven weeks.
Origin waited two months.
Eos waited three.
Thilanushinyel, ten.
Everyone else is out a decade at least. Samaria's ten years, almost ten and a half.
Aurum is out eleven.
Rêverie has been separated for sixteen years.
All the Bells - and Elspeth, who was stuck in Downside for a day and a half on her end and whose mother was very upset - are collected in the Belltower, as are two Bell-attached Sherlocks who happened to be along for the ride. They all memorize this list of numbers. Aegis replaces her earpiece. And then they all go home to notify their loved ones and staff that there's a party cooking in the Belltower.
(Shell Bell, who has no particular cause on her own account to be distressed, sends her Sherlock to invite Tony in while she refits the Belltower to suit a party of a peal of Bells and their larger-than-last-encountered families and circles of friends.)
"Um... everything? Lately I've been experimenting with making beads to sew onto dresses."
"Sorry, I have some input on that discussion over there," she says, pointing to a cluster of Bells and Tonies and one Sherlock who is rather firmly attached to his Bell and his Tony. "I'll see you around, I'm sure!"
"The admin," she volunteers, "said while I was there that if Jane had died, she would show up Downside eventually. I bet she could get the original Sunshine Jarvis too."
"Yeah," says Juliet, "Jane, ask the admin about that please? Sunshine's original Jarvis and any others available to her."
[Hey you!] Jane says to the admin. [Peal wants the dead Jarvis. Can they have him? What format is he even available in, can I get a hard copy I can land in the arms of his loving family?]
[The most convenient format would be the original house,] says the admin. [I can instantiate it here and you can move it wherever seems appropriate.]
[He's available,] reports Jane. [Admin says the most convenient format is the original house. Where do you want it put?]
"What an excellent question," says Sherlock. "Can we drop him just outside Sunnydale and hope no one notices?"
"I can go stand there so Jane can aim," Juliet says, touching her necklace, "but he doesn't know me, should you two come?"
"Is it going to be okay having two of them in the same world, or doesn't it matter?"
"I don't know, but it seemed worth asking," says Shell Bell. "I think it would be awkward to have two of us trying to live in the same world or I might've tried rehabilitating Shell instead of absorbing her."
"I don't predict trouble, and if there is some, we can always ask one of them if he would like to move."
"Do you have a specific place outside Sunnydale in mind?" Juliet asks. "Do you want to do this right now?"