jobRateCounted[fn_,Y_Integer]:=First[AbsoluteTiming[Do[fn,{Y}]]/Y;
SetAttributes[jobRateCounted,HoldFirst]

jobRatePeriod[fn_,time_]:=Block[{n=0},TimeConstrained[While[True,fn;n++]];n/time];
SetAttributes[jobRatePeriod,HoldFirst]