Upon activating the VIP hours players can gain an additional marching size and that depends on the VIP level.
Please know that the additional march would be added directly on the additional marching size that is highlighted in green once the VIP hours are activated.
Marching Size before activating the VIP hours:

Marching Size after activating the VIP hours. The example below is an additional 10,000 marching size for activating the VIP hours:

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