Playtime ranks are permanent and don't wipe.
Only active playtime is counted, meaning AFK time is not included. 
To check your current playtime, use /ranks

New (0 hours played)

• Access to /sethome for 2 homes
• Access to /home, /town and /tpr up to 10 times per day with a 15 sec delay
• Access to /bgrade (auto-upgrade building blocks when placed)
• Access to /remove (building and entity removal tool)
• Access to Furnace Splitter (splits ores into equal stacks in the furnaces)
• Access to Personal Recycler & Marketplace (available in the Server Shop)

Regular (3 hours played)

• Access to /sethome for 3 homes
• Access to /home, /town and /tpr up to 15 times per day with a 15 sec delay
• Access to /sil <url> (loads custom images to signs)
• +3 Backpack Slots
• 5% Increased XP gain on all activities

VIP (20 hours played)

• Access to /sethome for 4 homes
• Access to /home, /town and /tpr up to 20 times per day with a 15 sec delay
• +6 Backpack Slots
• 15% Increased XP gain on all activities

Veteran (50 hours played)

• Access to /sethome for 5 homes
• Access to /home, /town and /tpr up to 25 times per day with a 15 sec delay
• Access to Daily Veteran Kit
• +12 Backpack Slots
• 30% Increased XP gain on all activities

Gold (Supporter rank, available at the Shop)

• Access to /sethome for 5 homes
• Access to /home, /town and /tpr up to 30 times per day with a 10 sec delay
• Access to /skin (skin any item in the game with advanced options)
• Access to Supporter only skins in /skin menu
• Access to Daily Gold Kit
• +12 Backpack Slots
• 30% Increased XP gain on all activities

Expert (100 hours played)

• Access to /sethome for 5 homes
• Access to /home, /town and /tpr up to 35 times per day with a 10 sec delay
• Access to /skin (skin any item in the game with advanced options)
• Access to Daily Expert Kit
• +18 Backpack Slots
• 45% Increased XP gain on all activities

Platinum (Supporter rank, available at the Shop)

• Access to /sethome for 5 homes
• Access to /home, /town and /tpr up to 40 times per day with a 10 sec delay
• Access to /skin (skin any item in the game with advanced options)
• Access to Supporter only skins in /skin menu
• Access to Daily Platinum Kit
• +18 Backpack Slots
• 45% Increased XP gain on all activities

Legend (250 hours played)

• Access to /sethome for 6 homes
• Access to /home, /town and /tpr up to 45 times per day with a 5 sec delay
• Access to Daily Legend Kit
• +24 Backpack Slots
• 60% Increased XP gain on all activities

Diamond (Supporter rank, available at the Shop)

• Access to /sethome for 6 homes
• Access to /home, /town and /tpr unlimited times per day with a 0 sec delay
• Access to /skin (skin any item in the game with advanced options)
• Access to Supporter only skins in /skin menu
• Access to CH-47 Helicopter (available in the Server Shop)
• Access to Daily Diamond Kit
• +24 Backpack Slots
• 60% Increased XP gain on all activities

God (500 hours played)

• Access to /sethome for 7 homes
• Access to /home, /town and /tpr unlimited times per day with a 0 sec delay
• Access to CH-47 Helicopter (available in the Server Shop)
• Access to Daily God Kit
• +30 Backpack Slots
• 75% Increased XP gain on all activities