And by "tweaks" he means overhauling the entire thing for the 100th time

Client: I want X and it needs to do Y and I need it in 2 weeks.

Two weeks pass!

Me: here's X doing Y.

Client: WTF, I asked for Z that needs to do a,b,g,k,I,p,q,t, and w, you were supposed to have already done all this and have it ready for tonight!

Me:

"Sure, but a reminder that we're currently out of hours on our agreed time / have delivered against the additional spec. You'll need to buy more hours / get a new contract drawn up with legal. Let us know as soon as you've done that and we'll schedule something in as soon as we can!"

@C0D4 funny think I had lately with my client:
- This is not accurate to the mockups.
- Well, there are no mockups?
- Okay so I'll tell the UI/UX to prepare them and we'll have to work on all of this again. I'll schedule a meeting so we can talk about the UI changes because I'm still not sure.

@AlmondSauce wish I could answer him that way but since I work there as a consultant all he has to answer about time is: "Oh well this is unfortunate, I'll adjust the roadmap accordingly don't worry".