What hours are your Donor Support representatives available? 8 months ago Updated Our regular Donor Service hours are Monday – Friday: 9 a.m. - 5 p.m. PT, and closed on Saturday and Sunday. Recently viewed articlesDo's and don'ts of your Stand Up To Cancer fundraising pageHow does my community fundraiser benefit Stand Up To Cancer? Related articles I donated but did not get a tax receipt. What do I do? Tribute edits and/or questions