Again, from the report I read, it was quite extensive. One element of British debating style is that members often take interventions from their colleagues, so while the traditional format for a 30-minute Westminster Hall debate is to have one speaker present for 15 minutes, and another reply from the government side, that's usually with three or four interventions each, so the number of members who are in Hansard becomes greater than what might be assumed just by looking at the time.
On April 4th, 2019. See this statement in context.