Which model Duet? They've been on the market more than 15 years with several engineering revisions. A fault code should trigger when a malfunction occurs to help diagnose the problem.

my model is GHW9150PW1 . I have no idea when it it was purchased. Atleast 10 years ago.

is it worth sticking money into

Can't say without further information such as a fault code for a clue to what may be the problem. There's no fault code on the display? Model year is 2004. The serial number is coded for the year and week of manufacture if you want to know more precisely.

No code just flashes time left

What happens if you press Start to continue the cycle?

Try the Spin Only cycle with a bunch of clothes in, doesn't have to be wet clothes.

Pressing start does nothing. I can switch to rinse and spin only and it completed.

I suggested maybe it's tired . It has served me well

I can't offer anything more specific from afar without an error code.

Thanks for trying. Prob going with new one the parts and labor is awful high