A timeline for consultation and the delivery of the Launceston General Hospital Masterplan is not realistic, the Health and Community Services Union says.
Public submissions on the plan are now open until February with the masterplan expected to be completed in May.
HACSU Tasmania secretary Tim Jacobson said he suspected the process would get blown out.
"This process needs to take as long as it needs to take," Mr Jacobson said.
"My only concern, and this is borne out of recent experience with this agency and the government, is they are very big on review and process that don't end up in concrete decision-making."
Mr Jacobson urged the community to get involved in the process.
"It's a critical issues not just for those people who are in the system at the moment but in terms of having a system, and a LGH in particular, that is fit for purpose into the future," he said.
Mr Jacobson said while this clinical redesign process goes on the government needs to have a short-term plan in place to deal with increased presentations and ramping in the North.
Australian Nursery and Midwifery Federation branch secretary Emily Shepherd said the union would support extending the plan to allow for more consultation.
"... so that it's done in a methodical and structured way to ensure that it's not being pushed out for the sake of meeting a deadline," Ms Shepherd said.
"You obviously need it to meet the needs of the community and staff into the future."
Ms Shepherd said it was pleasing to hear an analysis on the expected healthcare needs of Tasmanian into the future mapped out against the extension of current services would be carried out as part of the masterplan.
The Australian Medical Association Tasmania welcomed the planning consultation process.
"Tasmania's health facilities must be given all appropriate consideration for upgrades to patient care infrastructure," the AMA said.
"The AMA and its members look forward to engaging with the health department throughout the process of planning for necessary improvements to the facilities required for care of Tasmania's public patients."
Labor health spokeswoman Sarah Lovell said Tasmanians had lost patience with the government's attempts to fix the health system.
"It also appears [Health Minister] Sarah Courtney is walking away from the plans for a co-located private hospital, which would be a massive vote of no confidence in the government's health management," Ms Lovell said.
Consultation on the masterplan closes at 5pm on February 14, 2020.
More information can be found here.