subscribe2: how to send hourly email-batches?

my hosting provider bluehost only allows 500 emails/hour, my subscribers list though is soon over this limit.

is there a workaround?

can i adjust the code of the plugin to send batches of – lets say – each 250 emails?

i understand there is “cron job”? would that work with the subscribe2 plugin? and how to include it?

many thanks.