The Jakarta Post is reporting that protests today are significantly smaller than original predictions, finding only a thousand workers at one of the protest locations. We can probably expect some wrangling in the press about what accurate estimates should be.
There is also the question of how you are keeping count. Demonstrations are scheduled in a decentralized manner, with protests occurring throughout the Jakarta area, so any official count will be difficult. There is also the issue of whether we should be counting workers at the demonstrations or simply workers who are not at work. Given reports of organizing going from workplace to workplace demanding workers walk off the job, there might be reason to think that the disruption of production is greater than the size of the crowds at demonstrations suggests.