I used to walk twice a day half an hour but on my first round of chemo I dropped it to one half hour once a day walk. My neutrophils on day 10 were zero. The other three rounds of chemo I was sent home with an injection to give myself the next day. About a month after chemo ended my neutrophils dropped again and I ended up fighting bronchitis for three months with two lots of antibiotics. I still only do the one half hour walk as I get too tired for the rest of the day if I do the morning walk and during summer I can't tolerate the sun.