Need few tips for converting cobol program

I have a project of converting some old c app part code, 46372 lines .
So after 25 years my boss told me that i can write it in whatever I
want.
(Actually I finally become the one who makes thisdecision in this
quarter of century).
So since I didn't write almost nothing in lisp since cltl1 I could
use some guidance:
1. Size of the lisp image vs the c exe.

2 How long does a rewrites usually takes from c to lisp ?
I must have it operational til december.

The speed and memory issues doesn't worry me, but for historical
reasons
a lot of our data goes on floppy.

J.T.

.

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