How soon can I have microneedling following IPL? I just had IPL on Tuesday and I have microneedling scheduled for this Monday.

Thank you for your question. 
 It is OK to do the two procedures a few days apart if the IPL calms down in the normal 24 to 72 hour window.  In fact, the two procedures are both stimulators of college synthesis and therefore will work synergistically to enhance collagen formation thus smoothing skin and giving them a more even, texture and appearance. 

I think combining IPL and Microneedling treatments can produce beautiful results!  I recommend a two week interval between treatments in order to allow the skin to completely heal.  Occasionally, I have a patient that takes a bit longer to heal, in which case we may wait closer to a month in between treatments. 
If your provider uses PRP (protein rich plasma) with the Microneedling, you will likely heal very quickly.  However, I would still wait two weeks minimum before doing an IPL. 
I hope you love the results!