I think that one time on every 2-3 days is enough. But it always depends on that How Often You Want To Make a Sync.
Yes this is right ans because there is no rule how often connect to computer these depends on needs.@ Gamma5 - there really is no 'correct' answer to your question about syncing your iPad - just depends on your needs (e.g. transferring images/music/movies/etc.) and the need to 'back up' your iPad, if using a cabled link for that purpose (i.e. vs. iCloud); the latter may be your most important consideration, i.e. if you are making a lot of changes on the iPad (addition or removal of apps, data w/i apps, etc.), then more frequent backups may be desired - SO, really up to you. Dave