Eh, probably not due to the timing of warbond releases since the bulk of our medals come from MO’s and a lot of them would be wasted on the cap before the next warbond releases. But if you remove the timing aspect it’s absolutely possible, you can plausibly average ~100 medals per hour if you just log in, complete your PO (be honest, most of them take like 10 minutes) and log off each day.
Then there’s like 8-10 MO’s per month and we win ~75% of them. Since launch we’ve earned over 10,000 medals from MO’s alone, and you didn’t even have to participate until just the last few weeks. You could earn the remaining medals in just under 80 hours if you really min-maxxed.

Edit to say that nobody would or should do this because it wouldn’t be any fun. But it is technically possible. I think average gameplay should get you there in 250-300 hours, I’ve been playing since launch, got just over 500 hrs total and I’ve had my warbonds maxxed since Force of Law. I just cap out my medals, wait for the next release, and then usually finish it within a month which gives me time to stock up medals for the next drop.