I've been practicing sweeps for around 5 years, so I have it easy when learning solos with sweeps. It took me something around 2 weeks of playing around with the solo to get it down decently. It took an extra 1-2 hours to be able to play it blindfolded.
Thanks! Glad you like.
I consider myself a guitarist too and I also love fretless bass. Hence I purchased a cheapo fretless 6 string. I really haven't played with other fretless basses so it's hard for me to compare it, but it certainly doesn't sound as good as the recordings I hear. If you can afford a better fretless bass, I say go for it. Maybe you can save up for a Jerzy Drozd fretless :).