It was clearly far more work to install than anticipated. Original estimation was 3 days ( that’s what it took just to get it to the state of ‘basic’ staircase ) . Last 3 days they’ve realised it all needs adjusting again ! . So will be back for half a day at the end of feb . Total install time 7.5 days . Tbf - it looks like a bitch to install . The treads effectively are floating off the steel - and rest on the one beneath . Adjust one , adjust them all .