Friend's Partner/Spouse Moving On After Death?

So here's the scenario: Your friend is happily married with kids. But, he/she dies. How soon is too soon for their young widower/widow to date again, socially speaking? How would you respond to the news? What do you feel is reasonable and fair?

Please explain your response to the poll. Thanks! :D

Friends Partner/Spouse Moving On After Death?
One year is long enough.
Two years.
Three to four years.
Five-plus years.
They couldn't have truly loved them if they even consider it.
Select gender and age to cast your vote:
Updates
1 mo
Thanks for the input. Much appreciated! :D
Friend's Partner/Spouse Moving On After Death?
Post Opinion