Azurewraith
Explorer
From a meta (rest) perspective you can assume 6-8 encounters and you have (now) 4 hours and 45 minutes of time to complete your quest. So at this stage, anywhere up to 4 short rests. Things may happen that reduce that time however. Myrkyn has already indicated that Dragothas lair is 'a few hours' away from White Plume Mountain.
Within that paradigm, you're free to rest whenever.
From a narrativist and game perspective, time limits like this can create a fun overarching meta-challenge. There is also a sense of urgency that drives the story forward.
Exactly a few hours lets call it 1hour 30 running to the mounting with no complications that leaves us 3hours 15 say 1hour exploration gives us 2 15 allocate 1 rest and 1 emergency hour. All numbers pulled out my ass ofc.
As for ready I am on way to work for a half day(woo) but I'm good to go