Oh I definitely need to change my cork. It rattles around loose in the head joint even with the cap screwed in. Unscrew the cap and the whole thing just drops out the bottom. If your cap turns and turns and turns, you need a head joint cork. They dry up and need to be replaced. One guy I ran across claims he replaces his every 3 months (!!!). That seems excessive.
But so does "never". LOL!
As for practice, as you can see from my sig I have a lot of instruments to practice. Currently out of the rotation is the keyboard (because I still haven't found the power block for it), the tenor sax (because I don't have it in hand yet), and the alto clarinet (ditto). Well and the Bb clarinet as obtaining it is still "in progress". OH and the tenor uke, if I put that on there yet, because it hasn't arrived yet either (in a couple of days).
My practice consists of picking up an instrument, playing it for 10 or 15 mins at a go, putting it down, puttering around with whatever chore needs doing, sitting down and picking up another instrument and playing IT for at least 10 or 15 mins. I do that all day long, cycling through all the instruments I can reach, and I keep them all out where I can get them so I don't even have to open up a case.
I can manage my uke for up to an hour by now, but it started out with the same 10-15 min "practice session" in the beginning. And I mainly keep that down to about 20 to 30 mins at a time to keep it "fresh". The flute - since it needs a head cork and sounds absolutely terrible - really only makes it for 5 min at a time. Hope to improve that when I get a new cork installed. Would have that by now if not for USPS weirdness regarding my chosen synthetic cork manufacturer. I have a new mouthpiece coming for the alto sax, but I tootle on it multiple times throughout the day as well. Problem with it being it is dry here in the winter and I can only play it with my synthetic reeds, which I accidentally purchased too soft. Not sure how I managed that. But if the new mouthpiece doesn't fix that then I'll drop another $25 on harder synthetic reeds. Sounds pretty awful in the meantime but at least I'm building my wind and embouchure.
I've only been at this a few weeks, maybe a month, by now, after a 35 year gap. Health issues only recently clearing up.