Hinode bills for what you run, by the minute, after you have run it. There is no plan to pick and no allowance to use up.
Ask for the figures rather than remembering them. Prices are worked out from a rate table and they move; a rate quoted from memory is a rate we may not charge. Every current number — the hourly price of the workspace's own machine, the price of each machine size, storage, traffic, and the minimum a machine is billed for — comes from the price tool, and the answer is what your invoice will use.
The four things that bill
A machine that is awake. The workspace's own machine while you are working at it, and each machine you attached while it is running. This is where nearly all of the money is: a large machine costs many times what the workspace's own does.
A machine's disk, while the machine exists. It is charged whether the machine is running or asleep, because the disk is kept either way. Deleting the machine ends it.
The shared folder, on what is written in it. Nothing is provisioned, so nothing is paid for until you put something there.
Traffic out, when something large leaves your machine. Streaming the desktop is not billed separately.
A machine is billed for a short minimum however soon you delete it, so starting one and killing it immediately is not free. The price tool states the minimum.
Machines put themselves to sleep
A machine that nobody is working on pauses itself. "Working on it" means what you would expect: input on the screen, the graphics card doing something, data leaving the machine — or any process you started still running, including one started over SSH and left behind. A quiet job is not an idle machine: a training run that is downloading a dataset with the card at nothing counts as busy, and will not be paused underneath you.
The other side of the same rule: something you forgot — a stuck script, a session you never closed — keeps the machine awake and billing. If a machine is not pausing when you expect it to, that is what to look for.
Pausing stops the expensive part. The disk stays, and so does everything on it.
The budget
You can set a monthly budget. It emails you when you are most of the way through it, and again when you reach it, and it stops nothing: work in progress is not killed and nothing is refused. It is a warning, not a brake — the brake is pausing or deleting what you are not using.
What a bill looks like
One invoice a month, itemised by what ran. Nothing is charged in advance, nothing expires, and there is nothing to cancel except the machines themselves. A workspace with everything paused costs what its disks cost and no more.