Remaining wake time exceeds last wake window!

Baby is 6 months, usually on 2.25/2.5/2.75/3. His wake windows today were 2.25/2.75/2.5 so far. He’s usually a short napper but today slept 2 hours for his first and then another hour for his second nap!

We usually do 10-10.5 hours of total wake time. He’s only at 7.5 hours of wake time so far. And I don’t think he’s likely to go down for his third nap (esp as he’s already hit 3 hours of naps…). He’s been up for 2.5 hours already and we typically do 3.5 max wake windows at most.

Do we just do an earlier bed time, in an hour, and settle for total wake time of 8.5 hours today? Or do another ~20-30 min cat nap to add a wake window?