What's your time horizon ?

I guess as one gets older, you have more time for reflection to dwell on both the past and a potential future. On a latter, given our finite existence, I often wonder how I would react or behave according to different timelines ?

For example, I ask myself sometimes what would I do if I had one month, one year or 5 years respectively to live ? How much of a different person would I become according to each time horizon option ?  Would I travel the world, seek out past friends and family, write my memoirs, start a new hobby ? The possibilities, though endless, would need to be realistic according to time. And that my friends is the conundrum....how do you know what to do if you don't know what timeline you're on ? It is a well-worn cliche to say you "live life like there is no tomorrow". But suppose there is a tomorrow, in fact several years or decades, then what ? Questions, questions...