The recent decision of ICC about the occurence of T20 world cup states that the next T20 worldcup will be after an year to the recent one. So here is my advice for the gap between the worldcups..

If you take it as an equation, a 50 overs world cup occurs every fourth year so 50/4=12.5, according to the result T20 world cup, 20/x must be equal to 12.5 (where x correspond to the number of years a T20 world cup should occur. So we can now solve this equation by 20/12.5 that is equal to 1.6. Now we will solve 1.6 years which becomes, 1 year + 0.6 year, 0.6*12=7.2 i.e. 7 months + 0.2 months now 0.2 * 30=6 i.e. 6 days. So the Final answer is 1 year 7 months and 6 days... This is the time interval between the occurrence of each T20 world cup (This is my suggestion to ICC. Guys follow it)