function onRun( error, time ) {
		var t;
		if ( error ) {
			return done( error );
		}
		t = time[ 0 ] + ( time[ 1 ]/1e9 );
		if (
			t < MIN_TIME &&
			opts.iterations < MAX_ITERATIONS
		) {
			opts.iterations *= 10;
			return next( onRun );
		}
		// Begin timing the snippet...
		return next( onFinish );
	}
Callback invoked upon running a pre-run to determine the number of iterations.

@private
@param {(Error|null)} error - error object
@param {NonNegativeIntegerArray} time - results
@returns {void}