Savarez last longer than D'Addario strings. Depends also if you're playing in first positions all the time. Then they will go quicker.

Usually the "D" string gets worn first and the "B" (or "H" if you're that way inclined) will sound flat. Also if the guitar stays in tune more when you pick it up. Less tuning to do but the strings are on their way out.

I change mine about every 4 - 5 weeks, but I use in almost every day.

Chas