There's a conflict between in-game and table time here. Ritual casting takes ten minutes in-game, but it's essentially instant at the table. Clearing 2,000 feet of corridor might take ten minutes in-game, but at the table it requires rolls, descriptive dialogue, clarifying questions, and player and character decisions. If there's nothing in that 2,000 feet, then there's no value in the rogue clearing it; every thing in it, whether a door or a trap or a monster they find or whatever, adds extra table time to the task.