If it makes you feel any better this is very common in small to mid-sized US tech companies as well. In every team I've been on that had an oncall rotation it was a full week 24/7 per person, that rotated among team members. Even at Google we were on call for our own service overnight and didn't have SRE / other time zone oncalls.
But the number of pages and other work varied significantly between teams. The worst was risk at Square in 2016, where we routinely got paged 40+ times a week (mostly noise) and when real incidents were most likely on Saturday morning. The best was Instant Apps at Google where we got a ~$5k bonus for each week of overnight oncall and almost never got a single page.
