He has time to rest it, and I hope it does, or we're dealing with a Joakim Noah situation here.
And Noah is a warriors for playing through plantar fasciitis, I'm not sure if Olynyk can handle that. Very bad for his development.
Rest it KO.
Noah is a beast, as are many other NBA players who play through something like that.
I developed plantar fasciitis a few years back while I was traveling in Europe. At the time I had no idea what the hell was wrong with my foot and I like to consider myself someone with a pretty high pain threshold, but it was honestly excruciating with every step.
I had to just power through it during the couple of weeks I was walking through Europe, but it took 2 solid months of rest after that for me to not feel sharp, overwhelming pain with every step.
My step-father also developed plantar fasciitis about two years ago and it took him more than a year of rest, daily stretching, and wearing a specialized boot during the night to make it go away. Even now it will flare up on him after a long day on his feet.
I couldn't imagine trying to play basketball on something like that. Hopefully KO gets the rest he needs so that come October this isn't an issue for him.