Code snippet from spm_fmri_spm_ui.m from most recent version of SPM8:
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for i = 1:nsess, ntr(i) = length(SPM.Sess(i).U); end
Fstr = sprintf('[min] Cutoff: %d {s}',min([SPM.xX.K(:).HParam]));
SPM.xsDes = struct(...
'Basis_functions', SPM.xBF.name,...
'Number_of_sessions', sprintf('%d',nsess),...
'Trials_per_session', sprintf('%-3d',ntr),...
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So it looks like number of trial _types_ (or number of conditions), not number of trials.
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