Half of $31 is $15.50, so time and a half lands at $46.50 per hour. That's the floor for FLSA overtime at this wage — some states' daily rules and many contracts use the same 1.5x rate for other premium hours too.
A 40-hour week at $31/hour grosses $1,240; add 10 overtime hours and it's $1,705. Because overtime hours pay 1.5x, those 10 hours deliver the earnings of 15 regular ones — the fastest honest raise available without renegotiating your wage (about $64,480/year at full time).
Working these hours in 2025–2028? The $15.50/hour premium portion may be federally deductible — see the no tax on overtime calculator. And if your employer pays 2x for some hours, that's $62.00/hour — the double time calculator covers it.