gridjam

Hmm, if it's taking you too long Andrew, you might be attempting a solo that's a bit beyond your ears and fingers? The fist solo I tried to lift was Trane's solo on All Blues, oops. Best to get the Miles and Cannonball solos together first. In other words, works that are not too complex ( harmonically or rhythmically) and are within your present vocabulary. Since I had never practiced, played OR read groupings of fives or sixes, let alone even played much double time (I was 15 at the time) there was really no way I was going to get the Trane solo on paper, let alone on my horn. So! Plan B: Chet Baker, Lee Morgan, early Freddie, Miles (Kind of Blue) Louis, Clark Terry, Harry 'Sweets' Edison, Nat Adderly, Kenny Dorham,etc...(not just trumpet players...)
I transcribed about 30 solos on paper (and many more by ear) and learned a lot from the process. Eartraining, rhythmic and harmonic knowledge, phrasing( someone told me to write down every detail from short and long phrasings to breathe marks,etc-really helped my reading) and of course, memorization skills. My advice- Live with the solo for awhile, sing it, learn the tune, sing along with the solo,YES, write it out (it will take less time the more you do it)and finally, turn the paper over until you can play it by heart. LASTLY! If you really can't get the complete solo-check out a correct transcription of the solo (and or tune, this applies to lifting tunes too) and analyze the areas of your hearing that are weak! At the same time, disregard everything I just said and put on your favorite recording and jam along, 'fishing for fingers' (as Clark Terry says) until you get as much, if not ALL of what you are playing along with.
Last thought- someone once advised learning ALL of the solos and tunes from the album/CD? that you are into. Makes sense- it's a lot of work but gets you into more than just the ONE solo you may be after. HAVE FUN!!!