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147: Oops, yes of course I meant “years” not “days”.
By the way, the phenomenon of having most of the calendar falling on the same days of the week for subsequent years occurs when between the two years in question MarCheshvan and Kislev have 30 days each, and there is an extra Adar. That results in a span of 385 days between the dates, which is exactly 55 weeks. The other possibilities of # of days (353, 354, 355, 383, 384) are not divisible by 7 (so are not complete weeks).
The above only applies to the part of the calendar that is a constant number of days (between 1 Adar or Adar Sheni and 29 MarCheshvan).
Until this discussion, I never knew that Asara bTevet could be on Friday two days in a row. I think the only way is if in the first year, Rosh Hashana is on Shabbos in a leap year with 383 days, and the second year Rosh Hashana is on Thursday in a regular year of 355 days.
More generally, I never considered how it might work out to have two years in a row for the non-constant parts of the year(Kislev, and Tevet + Shvat). As somewhat of a calendar enthusiast (not an expert!) I might try working that out myself (though I am sure that the experts already have that at their fingertips).
Tal u Matar is scheduled to start the last night of Chanukah every nineteen years through 2127. Note that in 2051 it starts the night of Dec. 5 (as it advances a day every four years until the extra day in Feb moves it back to Dec 4 at night).
By the way, this takes into account the fact that in 2099, the date to begin will shift Dec 5th at night, and since 2100 will not have a February 29, Tal UMatar will stay that way (Dec 5 most years, Dec 6 every four years) until it shifts to Dec 6 at night in 2199. So actually, in 2146 from what I can tell Tal uMatar actually starts Motzaei Chanuka (Dec 5 at night)!
Two necessary disclaimers: 1. All of these calculations should be rendered moot with the coming of Mashiach and the reestablishment of the Sanhedrin
2. For anyone in EY, these calculations are already moot. After all the last day of Chanukah can’t ever be 7 MarCheshvan!