In an article titled "Call Time For Congress Shows How Fundraising Dominates Bleak Work Life" the huffingtonpost writes:
The daily schedule prescribed by the Democratic leadership contemplates a nine or 10-hour day while in Washington. Of that, four hours are to be spent in "call time" and another hour is blocked off for "strategic outreach," which includes fundraisers and press work. An hour is walled off to "recharge," and three to four hours are designated for the actual work of being a member of Congress -- hearings, votes, and meetings with constituents.
"Call time" is explained as being fundraising-related as well:
...whether it's "call time" spent on the phone with potential donors, or in person at fundraisers in Washington or back home.
Does that give an accurate impression of how much time US congressman spend fundraising?