It takes about 2 hours to fully charge the Sony SRS-XB10 speaker.
Yes, Sony SRS-XB10 does have the inbuilt microphone.
Sony SRS-XB10 is a mono speaker. However, you can use 2 SRS-XB10 at the same time with your device and they can perform as a stereo speaker.
Sony SRS-XB10 Wireless Bluetooth speaker comes with 1400 mAh Li-Polymer battery, which offers about 16 hours of play time with a single charge.