That's what the ET column is. In BE, you can control what the speed of datalogging is.
However you don't control how fast each hardware is polled. If the datalogging is run faster than the hardware can keep up, then you end up with duplicate values for logs. This is common when logging 2 pieces of hardware, one of which can run faster than the other. I have a QH and a serial logged Innovate LC-1. The QH can log well at 50ms and faster. However the LC1 can only log at about 150-200ms. So if I setup for 50ms logging, I'll get different values for things coming in from the QH, but the AFR from the LC1 will always have blocks of 3-4 lines with duplicate values.
89 Ranger Supercab, 331 w/GT40p heads, ported Explorer lower, Crane Powermax 2020 cam, 1.6RRs, FMS Explorer (GT40p) headers, Slot Style MAF, aftermarket T5 'Z-Spec', 8.8" rear w/3.27s, Powertrax Locker, Innovate LC-1, GUFB, Moates QuarterHorse tuned using BE&EA