People shop at a crowded vegetable market amidst the spread of the coronavirus disease (Covid-19) in Mumbai, May 11.

Based on the experience of over 100 days of vaccination, experts say India is in for a long haul. In case the pace of vaccination against coronavirus doesn’t shoot up drastically and more vaccine candidates are not included, India could take another 3.5 years to inoculate 70 per cent of its population.