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The install brackets are:
<50,
50 - 100
100 - 500
500 - 1,000
1,000 - 5,000
5,000 - 10,000
10,000 - 50,000
50,000 - 250,000
>250,000
You can get through the first 4 bands pretty quickly, but the last one has taken a while. Battery Widget is now high up in the Productivity Category and is receiving around 1,000 - 2,000 installs a day. Also with just under a 60% retention rate, it is still installed on around 150k devices.
The question that remains though, is whether or not 250k is actually the final milestone. Or is there a some secret next level, like >1,000,000 installs, accompanied by a letter from Andy Rubin maybe?