How to configure for changing advertising mode slowly?

I have enabled advertising fast and slow mode. But changing from fast to slow mode is almost at same time. How to configure for changing advertising mode slowly?

The following is log messages of nRF52832 device.

00> <info> app: POWER_ON.
00> <info> app: BLE_ADV_EVT_FAST 01/01/70 - 00:00:07
00> <info> app: BLE_ADV_EVT_SLOW 01/01/70 - 00:00:07
00> <info> app: BLE_ADV_EVT_IDLE 01/01/70 - 00:00:07

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