Thirty new spot fires ignited between Wednesday night and Thursday morning due to lightning strikes, with the next 48 hours looming as pivotal to firefighting efforts due to improved weather conditions.

NSW firefighters are desperately trying to take advantage of easing conditions across the state, but they say they're "in for the long haul".

RFS and residents battle to stop the Gospers Mountain fire from destroying homes in Colo Heights. Credit:Nick Moir

"Over at least the next 24 to 48 hours, we've got more favourable conditions across NSW," said RFS spokesman Ben Shepherd.

"What that's enabling us to do is get on the front foot, and we are conducting a number of back burns across all fire grounds before we see a return of windy weather."