The World Conservation Congress starts next week Thursday.

Parts of the event will happen at the Hawaii Convention Center and the Blaisdell. Security will be high. There will be video surveillance on the streets around those areas. Police will be directing traffic and helping to protect the many high ranking officials.

As KHON2 first told you Monday night at 10 p.m., the Honolulu Police Department estimates that officers will rack up approximately $455,000 in overtime during the event.

This isn’t the first time Honolulu is getting hit with a big bill for protecting VIPs.

KHON2 found out from HPD, we’ve been paying tens of thousands over the last year to protect officials and dignitaries.

When Secretary of Labor Thomas Perez came to visit last July, police received more than $9,400 in overtime pay.

For Dr. Jill Biden, the vice president’s wife, one day of security cost HPD $3,800 in overtime.

Secretary of State John Kerry’s two-day visit back in May racked up over $4,200 HPD overtime.

One of the most expensive visits when it came to overtime costs was in March, when the Prime Minister of Tuvalu visited.

His eight-day trip ended up costing more than $18,000 in overtime.

But all that pales in comparison to what we shell out when President Obama comes here for his annual winter vacation. HPD had to pay out more than $340,000 in overtime pay during his last visit.

HPD tells us factors that affect overtime costs include the length of stay and number of movements.