The fecal testing is the most necessary. Most vets can do the testing in their office and give you results immediately.
There are no other tests routinely done with a glider well exam.
They vet will also do a physical exam - checking eyes, ears and general condition. You may also want to have the vet trim the gliders nails so you can see how it is done.
You will probably only need one day, if that to care for your little guy after surgery.
He will be sleepy when you bring him home the day of the surgery. You can keep an eye on him by carrying him in a bonding pouch that afternoon. My boys were fine by the evening hours when they woke up for dinner. I keep them separated from their cage mates the first night after surgery. I give a dose of the pain medication provided by the vet in the morning the day after the neuter. I then put them back in with the rest of the colony to sleep for the day. After that, they acted completely normal, slept as usual during the day and were as active as usual by dinner time.