If it helps - a single A level is designed to have Guided Learning Hours of 360 - over 4 months that’s about 22 hours a week study.
An HND is designed to have 2,400 learning hours. Over 12 months that’s over 46 hours a week with no time off at all (with normal holidays taking 6 weeks including bank holidays it’s 52 hours of study a week). It’s like completing 6 full A levels in a year.