Once support for Windows 10 native notifications is released, users who choose to use Windows notifications will be able to utilize Windows OS specific settings for the length of time to display notifications. Mac does not have an OS specific setting, so will not have the support.
Please add to the comments if you are experiencing this. I would like to know the OS and device you are using as well.
I’ll bring this feedback to the feature team and help get this investigated.
An error occurred while saving the commentVictoria Bynum commented
I'm not getting notifications on my phone (IOS) or on my computer (Windows 7 operating system, Dell computer) for messages to channels. I get notifications for chats.