Hi there, it always depends on which chemo they choose for you. I had ACT-H regime. The AC was given over 3 months a cycle every 21 days. The T...or taxol was weekly for 12 weeks and the H (herceptin) was every 3 weeks for 12 months. I had a Es+ and Her2+ bc grade 3 but just inside stage 1 and no nodes.
There are other regimes that are 4 cycles over 3 months. What is chosen is depended on your bc and what your oncologist thinks will help best.
My surgeon and oncologist told me my surgery was basically curative but as mine was very aggressive still recommended chemo. I didn't want to have any regrets in 2 years not doing everything to ensure my best chances of cure. I too had complete body workup beforehand due to my aggressive cancer. Mine was clear.
I had a portacath inserted as had one vein they could use. Also as chemo went on I realised my veins were getting harder and harder to access. But I knew i was having 21 chemo treatments. If you are on a different regime it might not be necessary. A picc line as @SoldierCrab mentioned is another option. I've included a basic link about it. Kath x
https://www.mayoclinic.org/diseases-conditions/cancer/multimedia/picc-line-placement/vid-20084657