Question: How long did the 1989 Australian-region cyclone that was one of the most intense tropical cyclones on record maintain its peak intensity before making landfall ?

text: List of the most intense tropical cyclones
Australian region
Main article : Australian region tropical cyclone § Seasons Cyclone Inigo near peak intensityCyclone Marcus at peak intensity The most intense tropical cyclones in the Australian Region are Cyclone Gwenda and Cyclone Inigo . By 10-minute sustained wind speed , the strongest are Cyclone Orson , Cyclone Monica and Cyclone Marcus . Storms with an intensity of 920 hPa ( 27.17 inHg ) or less are listed . Storm information was less reliably documented and recorded before 1985 . [ 6 ]
Winds are often used to measure intensity as they commonly cause notable impacts over large areas, and most popular tropical cyclone scales are organized around sustained wind speeds. However, variations in the averaging period of winds in different basins make inter-comparison difficult. In addition, other impacts like rainfall, storm surge, area of wind damages, and tornadoes can vary significantly in storms with similar wind speeds. Pressure is often used to compare tropical cyclones because the measurements are easier and use consistent methodology. Tropical cyclones can attain some of the lowest pressures over large areas on Earth. However, although there is a strong connection between lowered pressures and higher wind speeds, storms with the lowest pressures may not have the highest wind speeds, as each storm's relationship between wind and pressure is slightly different. In the most recent and reliable records, most tropical cyclones which attained a pressure of 900 hPa (mbar) (26.56 inHg) or less have occurred in the Western North Pacific Ocean. The strongest tropical cyclone recorded worldwide, as measured by minimum central pressure, was Typhoon Tip, which reached a pressure of 870 hPa (25.69 inHg) on October 12, 1979. The following list is subdivided by basins. Data listed are provided by the official Regional Specialized Meteorological Centre, unless otherwise noted. On October 23, 2015, Hurricane Patricia attained the strongest 1-minute sustained winds on record at 215 mph (345 km/h).
Cyclone Season Peak classification Peak 10-min sustained winds Pressure
Mahina 1899 Category 5 severe tropical cyclone Unknown 880 hPa ( 25.99 inHg )
Joan 1975-76 Category 5 severe tropical cyclone 215 km/h ( 130 mph ) 915 hPa ( 27.02 inHg )
Amy 1979-80 Category 5 severe tropical cyclone 215 km/h ( 130 mph ) 915 hPa ( 27.02 inHg )
Kathy 1983-84 Category 5 severe tropical cyclone 220 km/h ( 140 mph ) 920 hPa ( 27.17 inHg )
Orson 1988-89 Category 5 severe tropical cyclone 250 km/h ( 155 mph ) 905 hPa ( 26.72 inHg )
Graham 1991-92 Category 5 severe tropical cyclone 205 km/h ( 120 mph ) 915 hPa ( 27.02 inHg )
Rewa 1993-94 Category 5 severe tropical cyclone 205 km/h ( 125 mph ) 920 hPa ( 27.17 inHg )
Theodore 1993-94 Category 5 severe tropical cyclone 205 km/h ( 120 mph ) 910 hPa ( 26.87 inHg )
Chloe 1994-95 Category 5 severe tropical cyclone 220 km/h ( 140 mph ) 920 hPa ( 27.17 inHg )
Pancho-Helinda 1996-97 Category 5 severe tropical cyclone 215 km/h ( 135 mph ) 915 hPa ( 27.02 inHg )
Thelma 1998-99 Category 5 severe tropical cyclone 220 km/h ( 140 mph ) 920 hPa ( 27.17 inHg )
Vance 1998-99 Category 5 severe tropical cyclone 215 km/h ( 135 mph ) 910 hPa ( 26.87 inHg )
Frederic-Evrina 1998-99 Category 5 severe tropical cyclone 205 km/h ( 125 mph ) 920 hPa ( 27.17 inHg )
Gwenda 1998-99 Category 5 severe tropical cyclone 220 km/h ( 140 mph ) 900 hPa ( 26.58 inHg )
John 1999-2000 Category 5 severe tropical cyclone 205 km/h ( 130 mph ) 915 hPa ( 27.02 inHg )
Paul 1999-2000 Category 5 severe tropical cyclone 205 km/h ( 130 mph ) 915 hPa ( 27.02 inHg )
Chris 2001-02 Category 5 severe tropical cyclone 205 km/h ( 130 mph ) 915 hPa ( 27.02 inHg )
Inigo 2002-03 Category 5 severe tropical cyclone 230 km/h ( 145 mph ) 900 hPa ( 26.58 inHg )
Fay 2003-04 Category 5 severe tropical cyclone 185 km/h ( 115 mph ) 910 hPa ( 26.87 inHg )
Floyd 2005-06 Category 4 severe tropical cyclone 195 km/h ( 120 mph ) 916 hPa ( 27.05 inHg )