I have the BenQ 1655, and I use Nero to imprint. How long it takes to imprint depends on how much and what kind of text & graphics you have. In my experience, if you only have a couple of small graphics and words, it only takes 1 run for 15 minutes at "best" setting. It will take 30 minutes or more if you have lots of stuff. Also, I found that text that I type only needs 1 run. However, for images that I import for the label, I need 2 runs. In this case, the whole process is going to take 1 hour or more.
I bought a couple of 30-pack of Verbatim 8x DVD+R LightScribe (MCC003) at Best Buy for $24 per pack. These burn and play great. Also, the inner rings of these LS discs look really cool. My clients have been mighty impress with me since I switched from the inkjet discs to these Verbatim LS discs.