I've had an English test recently. And there I had to choose a correct item:
The online courses really take the pressure off because you can spend your time till you understand it all.
The online courses really take the pressure off because you can take your time till you understand it all.
I chose first item (with spend), as I remembered some sentences with spend time such as: I spent a lot of time cleaning that room. But I made a mistake! The correct answer was The online courses really take the pressure off because you can take your time till you understand it all.
Why am I incorrect? What is the difference?