Fix update deployment duration (blank isn't an option)
Currently Update Deployments in Update Management has you enter in a total time, per "If Duration is left blank, no time limit will be placed on this update run. If a duration is specified, remaining unapplied updates will not be started after time expires. In progress updates will finish being applied." If you leave it blank or set it to zero, you'll be met with a message (upon clicking Save) that "Duration must be at least 30 minutes and less than a day." Please either allow zero/blank for duration or change the "If Duration is left blank..." message.
We have changed this in the Azure portal.