I would suggest we increase the time players have to join rituals from one minute to at least two.
The number of times I have explained the ritual system to people then given several warnings that I am starting a ritual only for people who intended to join to miss the opening is innumerable. Moving it from one minute to at least two may give people a little more wiggle room for their tabbed out, half afk, or just not paying attention friends who did actually mean to join in to have the chance to do so.
Another suggestion if this one is unpopular but would be more involved is a secondary prompt for the ritual leader to actually start the ritual so the leader can control the preparation and then start. It would be neat and may lead to less wasted offerings.