This depends on how big your account is and if you don't follow users indiscriminately. Twitter has a limit of 1000-2000 per day but it doesn't mean that accounts with 1M followers can follow more or that accounts with 200 followers are allowed to follow 2,000 per day. Twitter has it’s own algorithm so we like to warn our users.
To avoid Twitter’s spam filter we recommend for new Twitter handles (until they have 50,000 followers):
1)Following people who will be interested in you,
2) Following/unfollowing 50-200 per day.