Fully charged battery lasts approx 10-15 smoothies, depending on your smoothie recipe. F.ex. blending ice and other hard ingredients can discharge the battery faster.
Approximately 2 hours are needed to charge the battery with the USB type-C charger included in Millo packaging (65W power). 60W charger is minimum supported by millo, so if you will use charger from your iPad, which is only 18W, millo will not charge with that one.
If you will use more powerful charger (let say from some Apple computers you might have 90W) the charging time will be faster.