Eleven years of writing and reading:

Main fic reading phases:

1998-2000: Highlander
2000: Deep Space Nine
2000-2001: Farscape
2003: Harry Potter (Remus/Sirius; just a few months, really)
2005-2006: Highlander
2006: Life on Mars

It's interesting to compare these with my writing and publishing pattern:

1999:
1 HL fic started

2000:
2 HL fics started & finished (deadline fics)
1 DS9 fic started

2001:
2 HL fics started, 1 finished (deadline fic)
2 FS fics started, 1 finished

2002:
1 HL fic started and finished (deadline fic)

2003:
1 HP fic started and finished
1 FS fic started
1 HL fic started, 1 finished
1 FS fic started, 1 finished

2004:
3 FS fics started
1 HP fic started
2 webcomic fics started and finished (deadline fic)

2005:
nothing new started or finished, it seems

2006:
1 FS fic finished
1 HL fic started
1 BSG fic started
3 LOM fics started

2007:
1 BSG fic finished
4 LOM fics started, 1 finished
1 FS fic started

2008:
1 LOM fic started, 1 finished
1 HL fic finished

2009:
1 LOM fic finished

currently most actively working on:
1 FS
2 LOM

What's striking me about this is that my most productive writing phase rarely seems to overlap very much with my initial reading phase. Also, the reading phase is short, compared to the writing phase. Also, intensive reading in one fandom can overlap with intensive writing in another fandom.