Help With Spytools & Campaign Length?

[Strickland]

It's my first time using a paid spytool so im just working stuff out

When you guys run a campaign at what point do you begin to realize it's not going to be profitable, 5 days, 10 days, two weeks?

If i find an offer using my spytool that ran for 10 days and stopped, is that a campaign that was started, been optimized, hasn't worked out, and been stopped?

And if that's correct what sort of time span should i set the spytool at to find working campaigns?

Thanks in advance good