Technically yes, it is time-limited. But as many have already said, everyone experiences it differently. I wish I was a person who could just shrug it off and go about my day, but once I feel down, it ruins my whole day and there is no recovering. I am 24 years old but I have suffered from severe depression my entire life. Looking at how my life has been going, it looks like I will suffer with it until I die. And it isn't that I don't try to be happy, because I do. And I don't choose to be depressed or want this in any way. Sigh...my life looks pretty hopeless. But I have a girlfriend and a good paying job and a big house and all this stuff...yet I still get depressed.