As a serial buyer of shredders (professional hazard - I’m a tax preparer and have to shred quite a bit of stuff), I can say pretty confidently that any shredder costing less than $200 can’t handle the number of sheets it claims. When shopping or using, plan on about half of what they claim as a practical limit.
–Peter <== who still prefers shredding to tearing and soaking and scratching with a fork