Firstly I am sure you can cruise for as long as you like at the power / collective setting that gives you the least side slip . I am guessing around 60 knots straight and level with low torque .
Secondly I have done simulated failures with what we considered to be neutral pedals ( lifting both feet off doesn't work as the blades naturally throw some pitch on so you have to push some opposite in )
If you do a shallow approach with wind off the R H side you can get right down to 20 kn or less before touch down . You can either grab for throttle ( 6 inch gap from collective ) or you could get the pax to pull it back when you say pull !!! This is all on BA so same for all 350 s except B3 and Mil .