I believe it was 70 seconds for 100 bashes with fastest and 75 seconds with normal? The difference is extremely negligible though in all honesty, and considering the damage gap I don't believe crk would be able to compare to rod in dps even if it hits slightly faster.
5 Difference is a lot in DPS. Especially around late game damage:
[video=youtube;sdzmmnrgcmU]https://www.youtube.com/watch?v=sdzmmnrgcmU[/video]
The damage difference can peak at 50k+ with 5 bashes.