My mum started out getting the injections every 2 months, then down to monthly, then 2 weeks, then weekly, luckily DVA paid for them, but it wasn't that issue that really was a problem, it was the pain from the injections, that made her bedridden for 24 hours after, eventually she had to give them up, and I am sorry to say she was pretty much  blind by then, she was 89yo by then and passed not long after. She was having the injections for 5 years before she eventually stopped. Her macular, was pretty severe though to start with.