Letro would be faster anyway. But if you can only get A-dex go with it.
It's maybe better to start off 0.5mg per day and add another 0.5mh everyday, like this:

Day 1: .50mg Adex
Day 2: 1.0mg Adex
Day 3: 1.5mg Adex
Day 4: 2.0mg Adex
Day 5: 2.5mg Adex

Then keep that dose until gyno symptoms subside.
Then taper down this way:
Day 1: 2.0mg
Day 2: 1.5mg
Day 3: 1.0mg
Day 4: .50mg
Day 5: .25mg