@amabelleoj you can measure how long a certain amount of rows is in an alpha you have already made and then use that to calculate how long 79 rows would be for you. It depends on the string you use and how tight you knot.
@LocoEva no i dont think this would be a good first alpha. there are lots of color switches, and a special way to knot it on the sides. its also has a lot of base strings. i would recommend this as your 4 of 5 alpha. p.s sorry im responding so late.