A:
In my experience the talk time is fairly reasonable. I can make two or three hour long calls, between all of them listening to music without having to charge it.
Only thing is it does charge pretty slowly, even on high-amp ports. I find it takes about four solid hours on the charger for the light to finally turn off. (The light is orange when charging, and goes out when it's done.)
It's a decent product, for sure. I can only compare it to the last headset I had, which lasted about two hours, but was the cheapest option on another site.
Interestingly, my gaming headset seems to have about the same battery life, but the Corsair charges blazing fast compared to these. I wonder if it's a longevity thing on the part of Logitech? Maybe a slow charge is better for their particular battery. Either way it seems to take about four hours!
I'd recommend these to anyone looking for a bluetooth headset in this pricerange, though. The PC adapter fits in the outer part of the left headphone. This lets you plug it into your laptop when listening to particularly quiet YouTube videos. - It's a really versatile product, in all honesty!
Hope this was helpful!