What is an acceptable time for view's common display settings to refresh for everyone?

Hello,

I have noticed recently that after adding columns to a view and "saving as common display setting"  and checking the option to "apply the changes for all users and override the users' display settings in this view" it takes a really long time for those changes to be applied in the desktop and web. 

My questions are:

- how long does the process normally last?

- is there something that I can do at my end to speed up the process?

- can the user do anything other than refreshing constantly? 

Thanks in advance, 

Irene