It depends on your data acq board. Many boards require 2 counters paired together to produce a finite pulse train. And the other measurement (pulse width, period, freq, whatever) would require a 3rd counter.
This is true for all E-series and M-series MIO boards, which also only have 2 counters available. It's also true for 660x counter/timer boards but they have either 4 or 8 counters available. Finally, the newer X-series boards can produce a finite pulsetrain with only 1 counter, so you could do both tasks with 2. Plus, they provide you with 4 anyway. I'm less familiar with the cDAQ hw, but some of it is based on the same timing chipset as the X-series and might also work for your 2 tasks.