hello everyone
I will go directly into it.
I am currently working in Middle East specifically Saudi Arabia.
I am aiming to go to China this summer.
I did a quick research online and found that flights from Saudi Arabia to China (1 stop in Dubai for 7 hours) will cost 720 USD
While if I get separated tickets one to Dubai and then get another plane to China will cost me 400 USD

My question: Is it possible to get separated tickets from Saudi to Dubai and get my luggage then catch another plane which is originally from Dubai and send my luggage again then fly to China. Or since I get my luggage then I need to get out the airport and can't go to another terminal and send my luggage again?
If it is possible then approximately how many hours are needed to do such a thing?

Thank you