Robusta seeds stay fresh for a pretty long time. Im not sure if they will still be good if they have mold on them, but I think its worth a try. Windmill palms are a bit slower to germinate than Robustas are. I would say that 2-3 months is a pretty good estimate for germination time for Windmill palms. They are much slower than Washingtonias, but they do pick up speed when about 3 years old or so and have some adult fronds. Once they get planted in the ground, if given water and mild weather, they will grow fast putting up to 6 -12 inches of trunk a year in good conditions.
-Alex

I think im going to discard the ones that i sowed and disinfect the rest. Thanks

At this time of year (and in Zone 5b), I assume you are using bottom heat to encourage germination and hasten growth.--If not, it'll make a world of difference!--Your soil should be just slightly moist--not wet.