How much free space do I need to be able to activate an environment using conda?

Question

How much free space do I need to be able to activate an environment using conda?

I am trying to activate a conda environment that I have being using for a few months

I use:

conda info --envs

and get:

base                  *  C:\Users\jalazbe\anaconda3
py39_ed6                 C:\Users\jalazbe\anaconda3\envs\py39_ed6

then I try to activate and get the following error:

C:\Users\jalazbe>conda activate py39_ed6
NoSpaceLeftError: No space left on devices

I have checked that I have free space. Not much but 50Mb free space.