Wefunder recommends that founders update to their investor at least once per quarter, but you can also ask the founders for an update in the Q&A section of their fundraise page.
Most companies are also legally required to issue an Annual Report 120 days after the end of their fiscal year. The annual report is a more comprehensive update with their latest financials, board members, new financings, and more. In some instances, they may no longer be required to file this information, though we encourage them to do so anyways. Most companies have their fiscal year end on December 31st, and their annual reports come out by April 30th.