Yes, I use a 10 ml syringe & it takes about 8 or 9 minutes to complete the injection. As for soreness, I've been doing it so long now I hardly have mild soreness anymore & it never lasts more than 2 days.
For the record, I'm injecting so much because my Tren. is only 100 mg/ml, but my new batch will be 250 mg/ml, (now that I have a proven recipe) that will greatly reduce the volume of my injections.