I can design the cover of your book (front, back and spine) in Adobe
InDesign and/or Photoshop. My design style is graphical (using flat
colours, shapes, images and text, no photos).
I have set "in 1day", it may very well be shorter, but I think it's
good to sit on a design for a little bit in order to make tweaks and see
things with fresh eyes over a period of time. However if you need it
quicker that's fine.