The BJD face up can last pretty long unless you drop it (which results in chipping) or if you touch it constantly (the natural oils on skin will wear away the clear lacquer coating over the paint).
As for the BJD body blush, it can last long too if you don't play with your dolls often. Dropping or touching it will cause it to chip or fade though. Your doll WILL yellow overtime so maybe around that time, you might want to change/touch up on his/her body blush. Also, if you blush the joints, the clear lacquer coating will most eventually chip and fade off very fast if you constantly play with your doll. ^^
And tips to take care of face up & blushed body;
- Wash your hands before handling your BJD (prevents dirt from coming in contact with your BJD)
- Never touch the face-up
- Try not to put your BJD's shirt OVER their face because the friction could scratch the face-up. Just try to remove the head and put it back after you change his/her shirt.
- Don't leave dark colored clothing/wig on your BJD for too long, it can cause staining.
- For dirty spots, you can use Magic Sponge (buy from Daiso!) to clear it away.
That's pretty much it from me.