Fitting inside a dime is probably a rock chip maximum, but they can fix cracks now too. My Jeep just got a crack in the window yesterday, so I took it into the glass shop to get an idea for replacement. The glass place has a before&after crack repair hanging on the wall. Although the crack was repaired and probably wouldn't spread any more, I could still see the imperfection and opted for a new windshield.

1999 Contour SVT #1966/2760, Silver Frost/Midnight Blue Koni Kit, Mille Miglia MM-S rims, B&M shifter, Stazi mesh, SFCs, optimized Y-pipe & TB, SS break lines, K&N drop-in, Infinity Kappa speakers, MTX amp/sub