How long does it take for grape popsicle to harden?

It typically takes around 4-6 hours for grape popsicles to harden in a freezer set to 0°F (-18°C) or below. The freezing time may vary depending on the size and shape of the popsicles, as well as the temperature and humidity of the freezer. To ensure the popsicles are completely frozen and solid, it's best to leave them in the freezer for at least 6 hours before consuming.