Learning to do guitar solos?

I've been practicing hours every day of school holidays on scales but I've had to stop a bit coz my wrists are hurting, even though I play lightly. So I just want to know how much more it'll take to be able to do something, not a shred solo or Eruption or something crazy but just to play fast enough that itd sound good if i found a good tune. How long did it take you and how much did you practice? Should I be able to solo well within a year?