I thought it was the whole month, too.
Anyway, what I'm doing lasts the whole year (and hopefully longer). I have told my sister and my boys that any gift they plan on giving me (birthday, Valentine's, Mother's Day, Easter, Christmas, etc.) should be a donation to the NMSS. In other words, any money that they would have spent on a gift for me should be used as a donation made in my name.
I hope they will honor that request...and I'll be reminding them of it frequently.