yeah, flower time of an indica is normally 8-12 weeks.
flower time for a satvia is normally 12-16 weeks. as for yeilding more indicas do yeild more, but what you want is a satvia cross, thats mostly satvia, that way, you have the satvia benefits with the yield of an indica.
people will often say satvias yield more, but its because of the height satvias can grow at, it you had a 4ft plant of each, the indica would win.