Marshalls symphony jointing compound - Curing time for symphony compound

[mushy]

Does anyone have experience with using Marshall's Symphony Joint Compound which is supplied with vitrified symphony flags? My reason for asking is that after 4 days of using this product it still has not set fully. In some places it has cured but in other areas it is still slightly malleable. I am hoping this has something to do with the weather and the fact it has only been dry for a day or so since I completed the job. I applied it as instructed and fully soaked the product but was expecting it to be set by now. If you have any advice on this I would be grateful.

[sy76uk]

Ive used it and it cured quickly but I used it in the summer.
Its more than likely a weather issue.
If you have problems contact Marshalls directly and they will look after you.