[jononor]

Why take the unspecific "real time" answers as gospel? Just propose daily initially (or weekly or monthly), listen to their protests, and see if there are good reasons why it needs to be more often. Then pick a suitable interval that fulfills their needs and that you can guarantee. If you offer pink fluffy unicorns for free, people will always pick them, without thinking.

[ozim]

Well it is not clear from my initial post but I do propose daily or whatever else than just "every SeCoND BecAuSE we NeeD iT NOW!!!" but people that are clicking the system right away expect stuff to happen "right away" - and any amount of explanation does not work.

Bonus points for trying to explain you want to implement "eventual consistency" - keep in mind I have added {“real time” (not going into details what real time means really)} in text to indicate that I am not some junior whining around but someone with deep understanding of computing...