Uptime data is actually stored in seconds. You can perform calculations with SQL to get the uptime in minutes, hours or days.
Ceiling (tblAssets.Uptime / 60 ) -> uptime in minutes
Ceiling (tblAssets.Uptime / 60 / 60 ) -> uptime in hours
Ceiling (tblAssets.Uptime / 60 / 60 / 24 ) -> uptime in days
A sample report that lists the uptime in hours can be seen below.
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tblAssets.Lastseen,
Ceiling(tblAssets.Uptime / 60 / 60) As Uptime
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Where tblAssetCustom.State = 1
Order By tblAssets.IPNumeric