What? If you're posting a suggestion like this I think you should go much more into detail.
Admin applications imo should never need a maximum time limit?
Reg and VIP applications also shouldn't as it is necessary in some cases to extend the time past a week. As well coolz is the only one who deals with VIP applications and I don't think he's going to babysit them like that. I don't see why it would be necessary. Reg applications are also usually locked pretty regularly. There's currently one open which I will now deal with.
Why are you making this suggestion though?