Requesting reduction in reviewer load for NeuRIPS? [D]

I didn't submit any but did place bids on some papers. I got assigned four papers. I have a bit of travel coming up and I don't think I will be able to do justice to as many the papers, especially in the rebuttal period. Is this the standard reviewing load? In other communities I submit to, generally the AC themselves are assigned four papers. In addition to reaching out to program chairs, is there any other way?