Thermal degradation of 3D printed ABS (and other plastics)
To answer your question briefly: No, ABS will not survive for a duration of at least one year at 80-100°C.


If you look at the chart above (from Tiganis/Burn), you'll notice, that the blue line (ABS 90°C) is decreasing. I did an eyeball calculation of the graph and arrived at the equation (J for break energy, h for hours):

J = -0.002h + 14


Based on that, a break energy of 0 Joule will be reached after 7056 hours or 294 days.

If you roam around internet forums on 3D printing, you'll find that that value is in the ballpark of people's experiences. I remember one case, where someone put out a piece of ABS in the sun and it broke down after a year.

Tiganis; Burn: The Effects of Heat Aging on Acrylonitrile-Butadiene-Styrene (ABS) Blends. In: Lacasse; Vanier (1999): Durability of Building Materials and Components 8, pp. 912-922.