Conditions in Australia are up for debate at the moment. Our employer (Air Services Australia)wants more "flexibility" - guess what the means for us ATCs.
Anyway a snapshot of our current arrangements (major centre). We work a 72 hour fortnight, in most cases on a 4 on 2 off cycle - this may vary 3 on 3 off, 3 on 2 off. Required days off are 1 after 4 shifts, or 2 after 5 shifts or 3 after 6 shifts (rostered). Maximum run of shifts (including overtime) is 10.
Shift lengths are between 6 and 10 hours - average 7 to 8. During a shift we would normally work about 2 hours at the console then have a half hour break - if staffing permits time at console is shorter/breaks are longer. The breaks don't apply on the overnight shifts.
We have a minimum 10 hour break between shifts - most cycles have "quick changes" so we start a cycle on a late shift then finish on a morning/overnight shift. End result is an apparantly longer "weekend". Alternatively the roster may be for a block of mornings/afternoons/nights... In many cases, the rosters are devised by the troops, or at least agreed with us, so on balance we don't do too badly.
We occasionally get called in on days off to cover absences - this is generally optional and paid at about time and a half, plus travelling time.
One of our biggest complaints as a group is the imbalance in the number of overnight (doggo) shifts across sectors. Some controllers work a doggo each cycle. Others (in different sectors) might average 1 every 3 weeks. Luck of the draw as to which sectors you work.
Thanks for posing the question - I too would like to see how other countries compare.