Lifetime campaign budget
A lifetime campaign budget is a fixed one-time budget, with a minimum of $25. This type of campaign will run without any pauses (unless the advertiser decides to pause the campaign manually) until the budget for that campaign is exhausted.
Suppose you have a campaign for which the budget is $1000, and you want this campaign to run as quickly as possible. You would select a lifetime budget. The campaign would then run and views would be delivered to your video as quickly as possible, until the budget is exhausted.