Duelbits reserves the right to cancel and/or make changes to the Campaign at any time.
10. I and Shuffle reserve the right to pause the campaign at any time.
I reserve the full right to add/remove any participants, push/cancel/reopen the campaign or any rules of this campaign.
Playbet.io and I reserve the right to make changes to the conditions and stop the campaign at anytime. Each started week will be paid for in full.
Betfury reserves the right to stop or alter this campaign at any time.
What does all this disclaimer mean to you?
I had to quote some few managers and the campaign rules or terms and conditions that shows that even if a specific period is mentioned for the campaign to run it can still be terminated.
So in my opinion it doesn't really matter whether the duration of the campaigns are mentioned or not as it's not even certain with the manager if the campaign will last or not it all depends on the campaign owners to decide if they want to continue or not.