Affect of Reindexing on Vacuum Times

I am wondering if reindexing heavily used tables can have an impact on
vacuum times. If it does, will the impact be noticeable the next time I
vacuum? Please note that I am doing vacuum, not vacuum full.

I am on a FreeBSD 6.1 Release, Postgresql is 8.09

Currently I seeing a phenomenon where vacuum times go up beyond 1 hour.
After I re-index 3 tables, heavily used, the vacuum times stay up for the
next 3 daily vacuums and then come down to 30 to 40 minutes. I am trying to
see if there is a relationship between re-indexinf and vacuum times. All
other things remain the same. Which means the only change I am performing is
re-indexing.

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Yudhvir Singh Sidhu
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