Expedited Onsite Rescheduling - What For?

I am interviewing with a startup and have my onsite scheduled to conclude next Tuesday. Today I got a message from recruiting saying they'd like to expedite the onsite to finish by this Thursday. It seems strange to go through the effort of rebooking things without a very clear reason, but I'm not sure what it could be. Any thoughts? Thanks in advance! Blind tax: - YoE: 6 - TC: 160k + paper money #interviews #interviewing #startups #recruiting