V2 API: How do I get author's kudo count for past month?

In the following code, I can retrieve the list of users who have kudos in the last month, then for each user I get their details to display them.

I wish to get the kudo count for each author, however the API doesn't seem to allow a comparison with the KUDO table's TIME attribute.

Any ideas?

<#assign lastMonth = dateToday - (30 * 24 * 60 * 60 * 1000) />
<#assign oneMonthAgo = lastMonth?number_to_datetime?iso_local />

			<#assign top_users = rest("/kudos/authors/leaderboard?max_age=one_month").users />
			<#list top_users.user as user>
			<div>User ID: ${user.id}</div>


			    <#assign userAvatar = rest("/users/id/${user.id}/profiles/avatar/url").value />
			    <#assign userKudos = rest("2.0","/search?q=" + "SELECT * FROM kudos WHERE time > ${oneMonthAgo} AND message.author.id = '${user.id}'"?url).data.size />
			    <#assign userInfo = rest("2.0","/search?q=" + "SELECT * FROM users WHERE id = '${user.id}'"?url).data.items />
				<a id="user_${user.id}" class="dk-component-item member" href="${userInfo[0].view_href}">
					<div class="member-icon" style="background-image: url('${userAvatar}');"></div>
					<div class="member-name">${userInfo[0].login}</div>
					<div class="member-badge">[badge]</div>
					<div class="member-kudos">${userKudos} <span class="label">kudo<#if userKudos gt 1>s</#if></span></div>
					<div class="member-rank">${userInfo[0].rank.name}</div>
				</a>
			</#list>