My Gazania seeds were sprouted under lights, no heat mat, but on top shelf by furnace so very warm.
I sowed them 17/3/ 2014 and there were sprouts on 20/3/2014-----so yes three days.
The Royale mix of Salpiglossis was sown 17/3/2014 in same tray,
and sprouts showed on 21/3/2014 so 4 days on the Salpiglossis.