"....how long has gold got left to rise....."
At least another year and at least another +50%.
When DOW:GOLD ratio drops to around 5x (currently 8x) it would be a prudent point to take considerable profits off the table.
DOW:GOLD might go lower, but it becomes an exponentially riskier trade the further the ratio goes below 5.
If you look at a long-term log chart of gold, you will see that the rate of ascent has been remarkably consistent, with no parabolic blowout.
Linear charts are meaningless because a £1 move on a £1 asset is a lot, whereas an identical £1 move on a £1000 asset is negligible but looks as significant unless you use log scaling.