Each request is different but as a rough rule-of-thumb we generally ask researchers to allow two weeks for document reviews, and three weeks to arrange focus / discussion groups.
Panel members return their feedback and questions to sent to the PPI team, who collate and anonymise it before sending it to the researchers. Researchers are asked to respond to the panel to let them know how they have incorporated public feedback into their research. We send these responses to the panel via our quarterly PPI newsletter.
Researchers can also invite panel members to get further involved in individual research projects – joining patient advisory committees, co-applying for research money with researchers and contributing to the research papers.