I'm about to start my development / exposure tests for hp5 in rollo pyro in my unicolor rig. Can anyone suggest a starting development time?

As far as exposure, I typically spot meter the darkest area of the scene that I want detail with my meter set to 1/2 the manufacturers film speed. This is for development in traditional soup (d76, hc110, rodinal, etc) should I do the same with the rollo?