Looking for a form component to select a period of time

I'm currently working on a very long form (can't be shortened) which I'm trying to make a bit more playful and easy to fill.

There are a lot of radio buttons, which is ok in terms of usability, but a bit boring for the user.

Do you have any idea how I could present the following type of question / answer in a more visual way?

There are other questions with percentages such as this one:

Anything I've tried so far seems to make the user's job more difficult but my client really wants something cool and visual.

Thanks