Well, here’s my example –
Pre-Base to TED; 120+ days; 100% recommended workouts completed at 100% difficulty - General - Xert Community Forum (xertonline.com)
Keep in mind I am old, had trouble completing any plans with TR, and started at one and a half stars for that progression experiment. The lightbulb moment for me was – geez, I can complete ALL the workouts with Xert because they scale to your fitness signature, status, and form.
This year I expect more modest gains because Xert left me so much higher this past November than in years past on other platforms. 
I am also manipulating IR as I progress this season including downwards or steady when I want to change hours per week. YMMV
Your improvement is going to depend on where you start from and how much TL you can handle (hours and intensity) over time which is primarily controlled by IR (improvement rate) and athlete type (focus) plus the selections you make based on recommendations (riding indoors and outdoors).
As far as my general advice goes – You need to accept the fact going slow is a contributor to going faster later. If you go hard all the time, you are sure to top out and plateau.
Enjoy the ride.