How long is the cable? Kind of critical information to provide!

The cable dimensions are 15.70 inches in length.

Does this work with Windows 10?

Yes, this product is compatible with Windows 10.

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StarTech ICUSB232C USB C to Serial Adapter - RS232 / DB9 Cable - Windows / Mac / Linux Compatible - Bus Powered - USB C Serial Converter

Connect an RS232 (DB9) peripheral to your USB-C device
USB to Straight-Through RS232 DB9 Serial Adapter
High-speed 921.6Kbps Baud Rate
Compatible with Windows, macOS, and Linux
USB C to serial adapter / USB C to db9 / USB C to rs232 / rs232 cable / db9 cable / USB type c to serial / USB-C serial adapter / USB-C serial adapter / USB C to serial adapter cable / RS 232 cable / RS232 adapter / serial adapter / serial port cable / RS232 serial cable / RS-232 serial cable / USBC / DB9 adapter