Arvehz
Around 15000x10000px-- sometimes less, sometimes more, but generally it's my favourite size range for prints.
This as well. however I do not actually do full digital art often.... I've started on another one recently taht is a proper render rather than a crap tacular doodle and it's happy but then I have 8gb ram... and a video card that is epic. So.... it can handle it no problem...
My old computer Beast had 2gb ram and would only have momentary lag towards the end of the image once there were layers and layers and layers (because I would do things like brocade on fabrics all by hand, and then trim designs all by hand... and decorations and jewelry... and yeah... This is probably why I hate digital art I bite off more than I can chew for my skill level, though am getting much better at it again...
Also said machine was overclocked as far as it could possibly go... current machine... not overclocked... granted old machine could still run almost the full adobe suite without freaking out too badly... new machine... Seriously it gets a troll face on it when I try to make it work hard... and then it asks if I'm mad bro cause it handles it like I was playing with note pad and calculator rather than adobe.
I don't think I will ever manage to kill this computer until things start getting far more advanced then they are now (like ALL 3d and projection sort crap...oh wait... this computer can handle anything 3d and 3dHD.... ) So it will take projections like 'obi wan kenobi your my only hope' to make me think about a different computer... God I hope they don't invent that stuff in the next two years... I want to gloat about the fact my computer is 6 years old and still performing better than most peoples new computers