We analyzed 29 pairs of time series in B and V bands of the recurrent nova RS Oph .
The observations were carried out in 2008-2017 with duration 0.63.6 hours , with time resolution 0.53.3 min .
We scanned digitally each series by data windows with various sizes \Theta and derived two of the simplest fractal parameters for every \Theta standard deviation D and structural deviation S .
Using the local minima of the structural function log S = f _ { S } ( log \Theta ) we unveiled 80 time structures , 42 in B band and 38 in V band , with time sizes 10-120 min .
About 3/4 of the time sizes belong to the interval 10-40 min and about 1/4 lie in the interval 60-120 min .
The respective cycles per day are 144-36 c/d and 2415 c/d .
On logarithmic scale , the distribution of the time sizes shows maximums at about 10 , 21 , 36 and 74 min .
The 10 min flickering is poorly detectable in our series and we found the most widespread time structures ( in about 1/5 of the cases ) have time sizes about 21 min ( about 69 c/d ) .
Using the deviation function log D = f _ { D } ( log \Theta ) we estimated the relative cumulative energy ( including the energy of the shorter structures in it ) , associated with the detected structure sizes , to be in the interval of the relative fluxes 2-11 % .
The energies correlate weakly with the logarithms of the structure sizes , with correlation coefficients 0.60 and 0.57 , under slope coefficients 0.04 and 0.03 in B and V band , respectively .
The distributions of the energies occur bimodal , with maximums about 4 % and 6 % in B band , as well as about 3 % and 5 % in V band .
The left and right modes of the distributions may be associated with the structure sizes 10 21 min and 37 74 min , respectively .