There were some info here, but not that clear to me:
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/temporary-residents/study-permits/who-needs-study-permit.html#courses
Short-term courses [R188(1)(c)]
Foreign nationals may enter Canada or remain in Canada without a study permit to attend a course or program of study of 6 months’ duration or less [
R188(1)(c)]. This exemption helps to facilitate access to short-term courses, regardless of their subject matter. The course or program of study may be part-time or full-time and should be completed within the period authorized upon entry (i.e., up to 6 months).
While a study permit is not required for short-term courses, an officer must accept and process an application for a study permit, even when the duration of the course or program of study is 6 months or less [
R188(2)].
Holding a study permit for short-term courses may allow students to apply later, from within Canada [
R215(1)(a)], to renew or change the conditions of their study permit for further studies. Study permit holders may also be eligible to participate in work programs that are available to international students [
R186(f) and
R205].
The duration of the course or program of study is often a more important consideration than the number of months the foreign national intends to study. With the exception of exchange programs, even if foreign nationals plan to study for 6 months or less, if the course or program is longer than 6 months, they need a study permit.
While a foreign national may attend a short-term course or program without a study permit at a non-DLI, they may not be issued a study permit to attend courses at a non-DLI [
R216(e)].
) Because I still don't know the answer!