mine goes on a monthly basis 3 fills so far , time gap might increase with time , and fills as well will get lower , first one was 2 cc second was 1.5 third was 1 cc and had 2 cc in time of operation , which makes them 6.5 so far in a 10cc heliogast band xD
but remember , its a tool to help loosing weight which means there will be a time that we wont loose weight by restriction only , excerecise is a must