How long does soreness last from recent heart cath and is it normal to have huge bruises in groin and leg at site of cath?

Up to a week & yes: Large bruising with femoral access is common & some people experience soreness up to a week. More common is 2-4 days....If there is a question please see your physician.

Huge? Not the norm: But possible - a bruise might form at the catheter insertion site, and the area may feel sore or tender for about a week. Let your doctor know if you have problems such as: a constant or large amount of bleeding at the insertion site that can't be stopped with a small bandage. Unusual pain, swelling, redness at or near the insertion site. Talk to your doctor about activity restriction.