Address CRAN minor example time threshold issue

We see Flavor: r-devel-linux-x86_64-debian-special-noLD Check: examples, Result: NOTE Examples with CPU (user + system) or elapsed time > 5s user system elapsed nextBest 5.452 0.004 5.480 stopTrial 5.266 0.040 5.309 Please reduce each example to less than 5 sec.