Under the laws, which came into effect for most workers in August 2024, employees are allowed to reasonably refuse to respond during out of work hours.
This includes not having to take calls or answer to emails.
Analysis by the Centre for Future Work found since the laws were introduced, the amount of unpaid overtime fell from 5.4 to 3.6 hours per week - a 33 per cent reduction.
Before the right to disconnect was introduced, average wage earners in Australia completed about 3.3 billion hours of unpaid work, with that figure dropping down to 2.2 billion.
Young Australians aged 18 to 29 were the group who experienced the greatest decline in unpaid work they were previously doing.
YouGov's latest poll found 86 per cent of Australians support the right to disconnect, including 75 per cent of Coalition voters.
For employees of small businesses, the laws will apply from August this year.
Opposition Leader Peter Dutton pledged to wind back the laws should the coalition win the next federal election, due by May 17.
ACTU Secretary Sally McManus said the right to disconnect had helped with the cost of living crisis, as people were getting paid for their actual hours of work.
"For too long, some employers expected people to work for free after their scheduled working hours," she said.
"It is astounding that the coalition is so incredibly hostile to Australian workers having the right to disconnect.Â
"Politicians might like being switched onto their jobs all the time, but most people actually have lives outside of work."
