Quarterly data released today shows the government's vote has slipped 4 per cent in the past three months, with the Liberals now holding 42 per cent support.

Labor's approval rating has also slipped - down 2 per cent to 31 per cent.

The Tasmanian Greens have received a 3 per cent boost, lifting them up to 19 per cent.

Will Hodgman remains streaks ahead of Bryan Green as preferred Tasmanian premier.

The EMRS data was released during a heated Question Time this morning.

As expected, much of the fiery session centred on looming stop-work action this Thursday.

Labor and the Greens grilled Education Minister Jeremy Rockliff about his decision to declare the day student-free across all Tasmanian state schools.

Greens MHA Nick McKim accused Mr Rockliff of using pupils, their families and teachers as political pawns.

Mr Rockliff conceded the decision would be disruptive and inconvenient, but lay blame for the development at the feet of his political foes and unions.

Environment Minister Matthew Groom this morning informed Parliament the government had received 37 expressions of interest for tourism developments in national parks and World Heritage Areas.

The Liberals earlier received more than 100 requests for more information from prospective developers.

Barbs also flew over the employment arrangements of flamboyant fly-in, fly-out spin doctor Ian Hanke.

Opposition Leader Bryan Green asked the Premier why documents released under Right to Information laws showed there were no invoices available for Mr Hanke's services to the government, which had so far cost $61,000.

Premier Hodgman said Mr Hanke had received the going rate for senior ministerial staff.

The government later confirmed two invoices for Mr Hanke's services were received, but did not fall within the scope of the RTI request.