Not long. In fact, they're gathering in the basement already. I simply Googled this article; I don't know who the group is that posted this back in June.
At midday on Fridays, Muslims gather to pray in a basement room of the U.S. Capitol. . . . At first just a prayer group, later a Muslim support group, the association is now looking outward to change what [they] see as woeful ignorance about Islam on Capitol Hill and beyond, according to Jameel Aalim-Johnson, a Muslim and chief of staff for Rep. Meeks, D-New York.
Some 100 non-Muslim congressional colleagues attended an association luncheon and the showing of part of a documentary on Islam in America. Visiting Imams from the Middle East recently met with association members. The congressional chaplain's office consulted them about offering classes on Islam on Capitol Hill, said association member Nayyera Haq, daughter of Pakistani immigrants and spokeswoman for Rep. John Salazar, D-Colo. “We're excited and hopeful,” Haq said of the group's new mission. "It's nice to be Muslim and feel hopeful about the future.”
Everything I needed to learn about Islam, I learned on September 11th, 2001.