It did that for me the first few times I setup meetings then after a few - something like 6th or 7th Meeting it stopped doing it and now it always kills the meeting at 40 mins
It is, however you have no restriction on who can barge into your call. It's a free for all if your connected as friends to others.
WEBEX same as zoom but without the 40 minute limit on free version. Only lint on free version is max 100 people . Dead easy to use https://www.webex.com/
WhatsApp is easiest if there are only 3 of you. Video call one and when he's up and running click the + sign and pick the other. Doddle. Used Zoom both pro version and free version and is good for quizzes where you can share files with pictures but if you just want a 3'way chinwag I'd use WhatsApp where you have unlimited time.
WhatsApp can be used by up to 8 people. You just need to call them using the camera button. You can keep adding them in to the call. It’s easier for beginners than zoom, teams, etc.