I was in similar situation I called IRCC and agent mentioned there is no timeline to respond to portal mail and you can respond after go on vacation/urgent trip that you are outside Canada and would return by this date.Hello everyone. I received portal 1 email recently. But I have an important travel out of Canada in a month. Can I reply to portal 1 after I come back, which would be about 2 months after receiving it? Any risk in replying late? Thanks for any advice!
As they would require your latest entry to Canada. I was able to travel on vacation and when I returned to Canada I replied to IRCC accordingly.
Hope this helps!