Charging time depends on various factors such as input source and cables. The product will charge any USB chargeable device (including phones) at the maximum speed that the device’s manufacturer has allowed for in the device configuration.
Yes, all of our products are certified and will have the appropriate markings on the products.
USB- PD enables compatible devices to charge at higher voltages and supports bi-directional charging and data transfer from both host and peripheral. Charge your USB-C phone at 5V 3A and your MacBook with the same cable and PD compatible charger. Get more detailed information from our Power Delivery blog post. (https://www.aukey.com/usb_power_delivery)
It is normal for a little heat to be emitted from the product, but it shouldn't be too hot to handle. In this case, please stop using the product and contact our support channel for more help.