Typically a battery which has been run down to an appropriate level should bounce back to at least 3.7v/cell, which is 11.1v of course. I think you might have had a couple more minutes left, but certainly no more than that.
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz