cucumber questions

my cucumber is about a foot high with 8 flowers on it,its in a pot at the moment and i will move it to a grow bag soon in the greenhouse,how big do they get before the first cuc appears.

If you have flowers, the cucumbers wont be long.

provided they have female flowers and beign pollinated 

I think how big it grows depends on what variety it is. Some are taller and more sprawling than others