I book one-on-one training by the hour.
I do group workshops billed by the day or half day. Half day sessions are often more effective in terms of group focus and energy.
I train up to ten people in a group. I recommend groups of 2 to 6 for more focused training. I'm reluctant to teach groups with more than 10 participants, but will do so when time and economic constraints prevail.
Please note that with Voice and Communication Skills Training, providing on-going or follow up support and further development maximises the efficacy of the training. As with any practical skills, changing vocal habits is often difficult for the individual, and additional training is obviously more beneficial.