Unfortunately, that meshmixer file is long gone. The support diameter was probably around 2.5mm, but I’m not 100% sure.
The support diameter should not, however, influence your layer curing time. Larger diameter supports will be stronger and resist breakage when supporting higher surface area parts.
Curing time is the amount of light dosage necessary to solidify the resin. At 100 microns for FTD, this should be around 4 to 5 seconds per 0.1mm layer using the default projector settings with integrated Intel graphics.
Changing the brightness/contrast/gamma settings on the video card and/or projector can result in a dramatic difference in cure times though. If you’ve changed settings, there’s no guarantee that your setup will be even remotely similar to mine. Out of the wavelengths of light the projector emits, only a small band of blue and unfiltered ultraviolet actually cure resin. When you change these settings, it’s likely that different frequencies of light will not be affected equally, especially in the case of UV which would be normally invisible to a person using the projector for home theater purposes, and thus would have no design in place to make it dim evenly compared to the other colors.