Good point mikk_13. I retired after 44 years 11 months and 18 days. My last customer was a Boeing 737 on airtest on my last day....operational to the end. Tower/Approach/Approach Radar/Area Radar. Over 25 years at West Drayton/Swanwick as Area Radar Controller with the rest at a variety of big and small aerodromes.
If you want a tip......just say "be level in X minutes". You should have time vector lines as one of the tools available. In answer to another earlier post.....as soon as you impose an artificial operating profile on an aircraft, the BADA model is no longer accurate.