I mean, I don't actually care if my windows are clean, and I already know I will feel no sense of reward when they are, so I just don't let anyone talk me into cleaning my windows. At least, not for my own sake.

I'd do it for my wife if she wanted it done, but then my reward is that my wife is happy having cleaned windows, and that is absolutely worth it to me.

Generally, I know what the reward for my long term goals will be before I start, and I am quite happy to accomplish them after all of that time. Am I throwing a party when they're achieved? No. Of course not. Do I feel a big sense of relief or satisfaction? Again, often no. But satisfaction isn't generally my goal. When it is, it hits hard, though.