What project size to select for project "Improve Drag and Drop support in blocks Engine"

Hello,
While submitting my gsoc proposal for project Improve Drag and Drop support in the blocks Engine,
I was confused what size to select Medium or Large as the
size of this project mentioned in Plone Foundation idealist is 250 hours

Google mentions ~175 hours as medium size and ~350 hours as large size, 250 hours is not mentioned anywhere

@sneridagh any help in this regard will be immensely appreciated.