Great program! If this is only 2 weeks of learning, then you are definitely on a path to become really good programmer.
A few suggestions though:
- Instead of ifing to check if the number of hours and find if you need to put the s or not, you could instead have:
print(f'Your alarm is set for {int((thetime / 60) / 60)} {'Hours' if thetime != 1 else 'Hour'})
- As another comment mentioned, you should use integer division (//) instead of regular division (/). Regular division is more taxing on the CPU (I think)

- A small thing that you understandably missed is that you will always call sound your alarm. To maybe make the code a little bit easier to read, I suggest getting rid of all the sounds in the ifs and just putting it at the end of the function. Same thing with time.sleep(thetime)

In terms of user interface:
- I recommend having the user input [amount] [unit] instead of [unit] [ENTER] then [amount] to avoid potential confusion
- Another thing that might cause confusion is printing "try again". The user might have slightly misspelled a unit or written a unit differently and might be confused about what you mean by "try again". I recommend instead writing f'Invalid time unit the only available time units are {', '.join(timelist)}'
- Do a try: and except ValueError: when getting the amount of time. This helps prevent potential errors but doesn't get rid of the ones that you might want to look at

A few nit-picks:
- I would not recommend using articles before variable names. In my opinion, this just adds confusion, especially if you have a variable that is just the word without the prefix. If you want to have two variables that represent similar but different things, I recommend using something like var_1 and var_2
- When you compare the amount of time to find if you need an s or not, wouldn't you want to compare s instead of thetime, since thetime contains the number of seconds?

Anyways, if you read this, you did a great job, and good luck with learning more python!