For the 1st 8 months or so, they checked every 5th injection; during that time my injections went from once a week, to every 5 days, to every 4 days (what I'm currently at). Every 4 days seems ok and they recently wanted to check in 2 months (so in early January for me after holidays and all that, from my last test in late October). I don't go in for actual visits though for about every 6 months.