Excellent find, Uni, although their temp conversions are retarded. 80 C is ~175 F, not 140.

Going based on that, we can probably safely take it to 175 without any risk.

My oven goes down to 170, so that will be our next test. 170, with checks every 15 minutes until the screen either gets perverted, or we get to 3-4 hours, whichever comes first.