'I might be 10 minutes late because the meeting lasted longer.'
'I'll be there in 30 minutes.'
'I'll catch the 20:30 train.'
Haven't you ever thought you wanna tell somebody such things right away?
However, it's NOT a good sight if you grab your mobile phone during a conference.
You can enter 6 basic messages, and add digits to specify the time according to the situation.
For instance, you entry messages like ' The meeting is delayed.' or ' I'll be late',
and when you want to implement it, just flip the digits and your e-mail is ready.
As for the digits , you can choose from duration of time like ' 2 hours and a half', or the present time like' 14:30' or NONE.
 
Here are some examples of the messages that you might want to enter.
' I'll be there in 5 minutes.'
' Sorry, I'll be there 10 minutes late.'
'I'll be home around 20:30'
' I'll be on the 21:18 train.'
' I'll have to go out tonight, so I'm not eating at home.'
You can also enter phrases without indicating the time, so it might be handy to enter frequently used phrases like ' Good morning' or ' Good night'.