Chemo timing

I started about five weeks after surgery, it was meant to be four but delayed due to a significant seroma. Timing may have to do with how quickly one heals after surgery, and the general view of treatment at the earliest opportunity to avoid further spread. Earliest opportunity however covers a lot - general
health, evaluation of initial surgery, availability of chemo clinic space, oncologist’s preference to be around for at least the first chemo treatment, lots of things. Essentially you want to be as effective as possible in mopping up
as few cancer cells as possible! 

I had an eight week wait from diagnosis until surgery, then just over 7 weeks later I started chemo.  I was Stage 3, ER positive and HER2 Positive.

My treatments were all very quick. Mastectomy 10 days after my finding the lump. Chemo 5 weeks after the surgery. I had Infusaport inserted 1 week before first Chemo session. I don't know if there is a highly recommended spacing for treatments. Probably as fast as available. Mine was ER +ve Stage 2 and Grade 3, Ki67= 50. I don't understand all of the decision making by the Drs. I believe some have Chemo before surgery.

I am presuming its statistical based around best average outcomes.   
Ive had surgery now so figure chemo start time will be a balance between my recovery speed and chemo department triaging/scheduling.