If it's for experienced managers, then 3-4 minutes might sound possible. Though being manager is not all about counting posts. You have to respond any question, complain, application which your inbox and telegram will be full of them.
Tbh, I know about some managers who do an in-depth analysis of their campaign participants to assure that the participants did well by helping the campaign through advertising it during the whole week. It's not an easy job to manage a campaign, takes a lot of efforts even if you consider it a 2 hour job. The time a manager will take to grade a sheet will depend on how many users are actually involved in the campaign, and other factors too including, but not limited to:
- Counting posts based on allowed and restricted forum boards.
- Checking if they have made specific number of posts in a mentioned board or not (like minimum x posts in Gambling).
- Checking the time gaps to see if there is any burstposting / spam or not.
- Seeing if a user received a negative trust? If yes, how valid is it? And then deciding whether to keep that user or not.
- Rectifying any errors (if made) while counting and correcting them.
- Sending the funds to users timely.
So tbh, it's a high-responsibility job regardless of the time it takes to be done.
Anyway I'm not against self-managed campaign. We can see Best Change's campaign run well until now. But having an experienced user to handle it will be more effective imo especially for a new project, which the project owner could be more focused on developing the project or promoting it to other platform(s).
Well, when we speak about a WHOLE PROJECT, we already know that they work with a team and not just one single developer. So if they try to manage their own campaign by assigning one of their own employees, then I don't think there's anything wrong as they will also hire their marketing expert only and when you already know how Best change did it, I don't think any other example suits here. However, having this forum's campaign managers represent their project here will work as a charm as they already have the experience of handling these campaigns and most importantly, they (the managers) have their reputation attached to their (company's) campaigns which is an icing on the cake.