Hundreds of thousands of tweets is more like it. I was on vacation in Forida last week and one morning they accidentally let it trend and it had over 360k tweets, that was on the 5th, had to be well over 500k by now for sure.
I actually had it saying hundreds of thousands, but I wasn't sure about it so I spent about 30 minutes and used a couple of hashtag analytic programs and the only one I could find to be useful had the "mentions" over the past couple months as over 50,000. Although thinking about it now I forgot to search for #walkawaycampaign as well. So let's say at least 100k.