I have run the new raid several times now, and every time we hit an alter it seems that the pace grinds to a halt. Last night while at the first alter, we waited 20 minutes (and then I waited even longer when an orthon one-shotted me and I was shunted to the penalty box). I can't see how it would adversely affect the game if we simply removed the alters from the raid itself, and just let us do this on our own time. To make sure that we are getting to the proper point to upgrade add to the chests a special item that will allow us to make the upgrade. Then you can take back what you earned, and upgrade later, instead of dragging out the process to a 20 minute break as everyone trades items and looks through the recipes.
I like going to be before midnight.