A federal judge on Friday granted former Illinois House Speaker Michael Madigan’s defense team four months to review mounds of documents submitted by prosecutors as part of the discovery process in a corruption case that prosecutors allege spanned nearly a decade. Judge John Robert Blakey said that, given the amount of material, he would allow attorneys for Madigan and co-defendant Michael McClain, a former lawmaker, ComEd lobbyist and close associate of Madigan, 120 days to review the documents. Assistant U.S. Attorney Amarjeet Bhachu told the judge that federal prosecutors had recently sent out the first portion of their discovery materials, which he referred to as “quite voluminous.” He also said another “very voluminous” batch of materials would be sent to defense attorneys toward the end of April. Bhachu said he would expect the defense would need several months to review the materials. Madigan’s lead attorney, Sheldon Zenner, asked for four …