Is 500 MB a lot

Well 500 Megabytes(MB) is roughly half of one Gigabyte(GB). so depending on how much space your computer hard drive holds will determine your definition of "a lot".

this is the official measurement posted by google....

1 gigabyte = 1024 megabytes .

Most modern domestic computers have hundreds of gigabytes of memory - in that context 500 MB is not a lot.