You can turn short enough for the rear wheel to hit the hitch on the mower. That's your limitation assuming your H has a narrow front end.
 
A u-joint can typically be run at 35 degrees or more BUT if only a single u-joint on the driveline bends when you turn (in other words, not an equal angle driveline and no CV joint), you'll get a vibration that worsens the shorter you turn. If the u-joints are worn at all it can make a racket. Just yesterday I was mowing with my 350 and our club's 5-ft pull-type rotary mower that had this problem. For anything less than a wide turn I was disengaging the PTO because the chattering was so bad.
 
Like mentioned below, your u-joints on your PTO shaft will let you know if you've turned too sharp...but, turning a bit too short while they're not under load and letting them chatter once in awhile won't damage much. Best bet is to just get out there and mow with it, you'll get a feel for what's ok and what's not from the seat of your pants-which will be the best source of advice you'll find.
 

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