Renewing PR card

Hi - I need to renew my PR card and wanted to understand how should I count the ‘physical presence days’.

  1. My understanding is that when using travel history, we include the date we entered Canada and date we left Canada, both in the physical presence days i.e., only days when we were fully outside will be counted as absence. Is this correct ? or, we cannot include days when I boarded flight or when my flight landed in the calculation ? Please let me know.

  2. What documentation do people provide when computing the physical presence ? Is there any form we list all absences and provide documentation for?

Thank you.