Depending the heat of your oven, it'll take approx. 9 to 14 hours...depending the thickness of the "batter" . Also make sure to have a wooden spoon or so in the dorr of the oven, so that the moisture can escape!
For me it was important to get a dehydrator...it's less electricity consuming I guess, also makes less noise, than the oven. Also I can regulate the heat under 42° C (Celsius)...so it's still raw quality.
Let me know how it's going 🙏🏽