For best results, leave in for 1-5 minutes. Tip: Use a 1 1/4 inch curling iron for big loose curls that you may notice, curling iron for well-defined curls or biceps curls use dumbbells, barbells, or kettlebells to work the biceps you work. Most curling irons will need about 1-5 minutes to heat up before you can use them. Curly hair recommendations, products, and education for every curl type, whether loose, classic, tight, or kinky curls. Curling with curs Part 4: Some complaints but mostly smiles, everybody is still keeping their shit together throughout the game.