The game textures should look good. If you run out of VRAM on your GPU, then textures will not load in well and you may get some bad looking textures.
In terms of drop length, there are many different lengths you will have on drops. including outpost prospects, which have unlimited times. One of the purposes for the beta is to explore what is interesting, fun, and how people play - so our team doesn't make assumptions and we can make changes to the game before it becomes solidified too much.