Incoming Senate Majority Leader Mitch McConnell (R-Ky.) has decided to make a tweak to the Senate's calendar in 2015. McConnell will implement an "aggressive schedule," Roll Call reported last week, including a plan to "have senators in town and voting on Fridays."

In July, we noted that the Senate has enjoyed not being in session on Fridays. Let's put a finer point on that now. Here's how often the House and Senate have worked Fridays since 1978.

That is perhaps less frequently than you work on a Friday, Thanksgiving week being a likely exception. In addition, there's a clear recent trend, particularly for the Senate: fewer and fewer times over recent years has the body been in session.

In September, we pointed out that Congress rarely works a full week, prompting some a vigorous response from some unlikely defenders. Congress does work all the time, we were reminded, and members of the Senate often travel on Fridays to go back to their states.

Which is true, to an extent. The conservative Washington Examiner looked at how often members of the Senate returned to their home states, finding that longer-term incumbents were less likely to do so. Two of the longest serving senators, Sens. Patrick Leahy (D-Vt.) and Orrin Hatch (R-Utah), returned to their districts 17 and 15 times a year on average, according to the Examiner's data.

Regardless, it seems clear that McConnell thinks the Senate should be in Washington and on Capitol Hill with more regularity than they have recently. The history of Friday working seems to go through these ups and downs. A trend back up probably won't incur many complaints from voters.